Question

Resolva: a) 5.(x-9) = 2x b) -3.(5-x)=2.(x-4) c) 6.(x-3)=4.(x-2)+11 e) 3.(2x+1)=7x+2

Answer 1

Resposta:

a) x = 15

b) x = 7

c) x = 21/2

e) x = 1

Explicação passo a passo:

$a) 5.(x-9)=2x\\\\5x -5.(9)=2x\\\\5x-45=2x\\\\5x-2x=+45\\\\3x=+45\\\\x=\frac{45}{3} \\\\x=15$

$b) -3.(5-x)=2.(x-4)\\\\-3.(5)-3.(-x)=2x-8\\\\-15+3x=2x-8\\\\+3x-2x=-8+15\\\\x=7$

$c) 6.(x-3)=4.(x-2)+11\\\\6x-18=4x-8+11\\\\6x-4x=-8+11+18\\\\2x=21\\\\x=\frac{21}{2}$

$e) 3.(2x+1)=7x+2\\\\6x+3=7x+2\\\\6x-7x=+2-3\\\\-x=-1 \\\\-x=-1 . (-1)\\\\x=1$

Answer 2

Resposta:

a) x = 15

b) x = 7

c) x = 21/2

e) x = 1

Explicação passo a passo