3x + 6 = 12
Subtract 6 from each side:
3x = 6
Divide each side by 3:
x = 2
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y-3x+6y=12 7y=3x+12 y=3x/7 +12/7
3x + 2 = -10 3x = -12 x = -4
all you do is subtract the 3x from both sides and you get:y = -3x + 12
6-3x+12=0 6+12-3x=0 18-3x=0 18=3x x=6
3x + 8 = 20 3x = 20 - 8 3x = 12 3x = 12/3 x = 4