Question

5-Determine o valor de x:
a) 6x = 2x + 16
b) 2x – 5 = x + 1
c) 2x + 3 = x + 4
d) 3(x-2) = 2x – 4 e) 5x – 3(x+2) = 15 f) 7(x – 2) = 5(x+3)

Answer 1

Resposta:

$a) \\6x=2x+16\\6x-2x=16\\4x=16\\x=\frac{16}{4}\\x=4 \\\\b)\\2x-5=x+1\\2x-x=1+5\\x=6\\\\c)\\2x+3=x+4\\2x-x=4-3\\x=1\\\\d)\\3(x-2)=2x-4\\3x-6=2x-4\\3x-2x=-4+6\\x=2\\\\e) 5x-3(x+2)=15\\5x-3x-6=15\\2x=15+6\\2x=21\\x=\frac{21}{2} \\\\f)\\7(x-2)=5(x+3)\\7x-14=5x+15\\7x-5x=15+14\\2x=29\\x=\frac{29}{2}$

Explicação passo-a-passo: