what is the value of x?
3 - x = 12
Add x to both sides
3 - x + x = 12 + x
3 = 12 + x (- x and + x cancel each other out)
Subtract 12 from both sides
3 - 12 = 12 + x - 12
-9 = x (3 + -12 = -9)
what is the value of x?
3 - x = 12
Add x to both sides
3 - x + x = 12 + x
3 = 12 + x (- x and + x cancel each other out)
Subtract 12 from both sides
3 - 12 = 12 + x - 12
-9 = x (3 + -12 = -9)