Question

x + (-15)= -13 + (-2)

Answer 1

Add 15 to both sides of the equation

Answer 2

you want to isolate x on one side of the equation

Answer 3

remember,

+(+1) = +1
-(+1) = -1
+(-1) = -1
-(-1) = +1

or

+*+ = +
+*- = -
-*- = +

Answer 4

Use the idea of balance @studyislandhelp

Answer 5

Whatever you do to one side of an equation you must do the same thing to the other, to keep the equation "balanced".

Answer 6

congrats on the 90, you're green now, @skullpatrol !

Answer 7

Thanks @SolomonZelman :D

Answer 8

yw