Question

X-5+2x-10+2x-5+2x+5=90

Answer 1

Resposta:

$x-5+2x-10+2x-5+2x+5=90\quad :\quad x=15$

Explicação passo a passo:

$x+2x+2x+2x-5-10-5+5=90$

$7x-5-10-5+5=90\\7x-15=90\\7x=105\\\frac{7x}{7}=\frac{105}{7}\\x=15$