Question

-7 = -1 + x/3, solve and explain with an algebraic property

Answer 1

$-7 = -1 + \frac{x}{3}$

Multiply both sides by 3 :

$-3*1 + 3* \frac{x}{3} = -3*7$

Refine:

$x - 3 = -21$

$x = - 21 + 3$

$x = - 18$

hope this helps!.

Answer 2

-7= -1+ x/3
⇒ -1+ x/3= -7 (switch side)
⇒ x/3= -7+ 1
⇒ x/3= -6
⇒ x= -6* 3
⇒ x= -18

Final answer: x= -18~