Verified answer

Explicação:

A) 3x - 7 = 2x + 5   ->   3x - 2x = 5 + 7   ->    x = 12

B) 7x + 8 = 4x - 10   ->   7x - 4x = -10 - 8  ->   3x = -18  ->  -18/3 = x  

->  x = -6

C) 4x - 15 = -2x + 3  -> 4x + 2x = 3 + 15  -> 6x = 18   -> x = 18/6    -> x = 3

D) 2x - 4 - 8 = 4x   ->  4x - 2x = -4 - 8   ->  2x = -12   ->   x = -12/2  

->   x = -6

E) 3x = x + 1 + 7   ->  3x - x = 1 + 7   ->   2x = 8   ->   x = 8/2    ->   x = 4

F) 360 + 36x = 30x -> 30x - 36x = 360 -> -6x = 360 -> -x = 360/6  

-> x = -60

G) 5x - 5 + x = 9 + x  -> 5x + x - x = 9 + 5 -> 5x = 14 -> x = 14/5 -> x = 2.8

H) 7x - 4 - x = -2x + 8 - 2x -> 7x - x + 2x +2x = 8 + 4 -> 10x = 12 -> x = 12/10 -> x = 1.2

I) -x - 5 + 4x = -7x + 6x + 15 -> -x + 4x + 7x - 6x = 15 - 4 + 5 -> 4x = 16

-> x = 16/4   ->  x = 4

J) 2 - 4x = 32 - 18x + 12  -> -4x + 18x = 32 +12 -2 -> 14x = 42 ->  x = 42/14

-> x = 1/3

K) 2x - 1 = -3 +x + 4   ->   2x - x = -3 + 4 + 1   ->  x = 2

L) 3x - 2 - 2x - 3 = 0   ->  3x + 2x = 2 + 3   ->   5x = 5   ->  x = 5/5   ->  x = 1

M) 10 - 9x + 2x = 2 - 3x -> -9x + 2x + 3x = 2 - 10 -> -4x = -8 -> x = 8/4

-> x = 2

N) 4x - 4 - 5x = -6 + 90 -> 4x - 5x = -6 + 90 + 4  -> -x = 88 -> x = -88

O) 2 - 3x = -2x + 12 - 3x -> -3x + 2x + 3x = 12 - 2  -> 2x = 10  ->  x = 10/2  

-> x = 5