Original equation:
-4(x - 3) = -x
Distribute -4 over terms in parens on left side:
-4x + 12 = -x
Get rid of -x on left side by adding x to both sides:
-3x + 12 = 0
Get rid of +12 on left side by subtracting 12 from both sides"
-3x = -12
Get rid of -3 in front of x on left side by dividing both sides by -3 to solve for x:
x = 4
