Question

A) 15+x=7
B) x-1=5x+10
C) 5 (x-1)+3 (x+1)=30

Answer 1

A)15+x=7
x=7-15
x=-8

B)x-1=5x+10
x=5x+10+1
x-5x=11
-4x=11
x=11/-4
x=-2,75

C)5x-5+3x+3=30
8x=30-3+5
8x=32
x=32/8
x=4

Answer 2

Resposta:

a) - 8

$b)-\frac{11}{4}$

c) 4

Explicação passo-a-passo:

$a)15+x=7\\x=7-15\\\boxed{x=-8}$

$b)x-1=5x+10\\x-5x=10+1\\-4x=11\\\boxed{x=-\frac{11}{4} }$

$c)5(x-1)+3(x+1)=30\\5x-5+3x+3=30\\5x+3x=30+5-3\\8x=32\\x=\frac{32}{8} \\\boxed{x=4}$