Explicação passo-a-passo:
a) 5x - 30 = 5
5x = 5 + 30
5x = 35
x = 35 ÷ 5
x = 7
b) 6x + 3 = 45
6x = 45 - 3
6x = 42
x = 42 ÷ 6
c) x + 8 = 15
x = 15 - 8
d) 7x - 20 = 4x + 100
7x - 4x = 100 + 20
3x = 120
x = 120 ÷ 3
x = 40
Resposta:
A) x=7
B)x=7
C)x=7
D)x=40
A)5x-30=5
5x-30=5
5x=5+30
5x=35
5x÷5=35÷5
x=35÷5
x=7
resposta
B)6x+3=45
6x+3=45
6x=45-3
6x=42
6x÷6=42÷6
x=42÷6
C)x+8=15
x+8=15
x=15-8
D)7x-20=4x+100
7x-20=4x+100
7x-20-4x=100
7x-4x=100+20
7x-4x
(7-4)x
3x
3x=100+20
3x=120
3x÷3=120÷3
x=120÷3
x=40
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Explicação passo-a-passo:
a) 5x - 30 = 5
5x = 5 + 30
5x = 35
x = 35 ÷ 5
x = 7
b) 6x + 3 = 45
6x = 45 - 3
6x = 42
x = 42 ÷ 6
x = 7
c) x + 8 = 15
x = 15 - 8
x = 7
d) 7x - 20 = 4x + 100
7x - 4x = 100 + 20
3x = 120
x = 120 ÷ 3
x = 40
Resposta:
A) x=7
B)x=7
C)x=7
D)x=40
Explicação passo-a-passo:
A)5x-30=5
5x-30=5
5x=5+30
5x=35
5x÷5=35÷5
x=35÷5
x=7
5x=35
x=7
resposta
x=7
B)6x+3=45
6x+3=45
6x=45-3
6x=42
6x÷6=42÷6
x=42÷6
x=7
6x=42
x=7
resposta
x=7
C)x+8=15
x+8=15
x=15-8
x=7
resposta
x=7
D)7x-20=4x+100
7x-20=4x+100
7x-20-4x=100
7x-4x=100+20
7x-4x
(7-4)x
3x
7x-4x=100+20
3x=100+20
3x=120
3x÷3=120÷3
x=120÷3
x=40
3x=120
x=40
resposta
x=40