144X = X2
144X - X2 = 0
(144 - X)X = 0
X = 0
or
X = 144
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x=18
(2x)ysquared
x = +13x = - 13
x + (3x - 2) = 14x + 3x - 2 = 144x - 2 = 144x = 16x = 4
You cannot, in general, solve one equation with two unknown variables. x - y = x - x2 Subtract x from both sides: - y = - x2 Change signs: y = x2 And that is as far as you can go.