Question

Equação

A) 4(10-x)=20
B) 5(x-8)=5+8(3x+1)

Answer 1

Olá,

Vamos lá,

A)
4(10-x)=20
40-4x=20
-4x=20-40
-4x=-20   *(-1)
4x=20
x=20/4
x=5


B)
5(x-8)=5+8(3x+1)
5x-40=5+24x+8
5x-24x=5+8+40
-19x=53   *(-1)
x= -53/19

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Answer 2

$a)\, 4\cdot(10-x)=20\\\\40-4x=20\\\\4x=20\\\\x= \dfrac{20}{4}\\\\\\\boxed{x=5}$

$b)\,5\cdot(x-8)=5+8\cdot(3x+1)\\\\5x-40=5+24x+8\\\\5x-24x=40+13\\\\-19x=53\\\\\\\boxed{x= -\dfrac{53}{19} }$