4x - 12 = 4
Divide each side by 4:
x - 3 = 1
Add 3 to each side:
x = 4
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8x + 12 = 4x - 4 8x - 4x = -4 - 12 4x = -16 x = -4
-4x-4 equals -16. Add 4 to both sides; -4x equals -12. Divide both sides by -4; x equals 3.
4[x+3]=4x+12 4x+12=4x+12 it's open.
6x+4 = x+12+4x-6 6x-x-4x = 12-6-4 x = 2
it is 4