Preciso do resultado das equações e dela feita (por favor):
a) 5x-20=40+8x
b) 6x+400=4x-40
c) 20-15x=10x-30
d) 9x-10=7x-100
a) 5x-20=40+8x
b) 6x+400=4x-40
c) 20-15x=10x-30
d) 9x-10=7x-100
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5x-20=40+8x
5x-8x=40+20
-8x=60
x=60/8 x= -7,5
B)
6x+400=4x-40
6x-4x=-40-400
2x=-440
x= -400/2 x= -200
C)
20-15x=10x-30
-15x-10x=-30+15
-25x=-15
x=-15/-25 x= 0,6
D)
9x-10=7x-100
9x-7x=-100+10
2x=-90
x= -90/2 x= -45