x=3
first, take the X's and move them to the side where the five is, giving you 7x, and move the -12 to the 9, so 7x=21 then divide by seven, and x=3
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2x-12
x=6Solution:x + 2x + 14 = 5x + 214 - 2 = 5x - 3x12 = 2xx = 12/2 = 6
5x + x - 6x + 2x = 2x
X=1.42857142857143
y = 2x + 5x - 12 = 7x - 12 So the zero is 12/7 = 1.7143 (approx)