With great difficulty because in the absence of an equality sign it has no solutions but it is just some kind of algebraic expression.
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x=18
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.
144X = X2 144X - X2 = 0 (144 - X)X = 0 X = 0 or X = 144
This is an expression and you do not solve an expression, but you can factor this one.X2 + 3X4X2(1 + 3X2)========
20/x2 -1/x = 1 Multiply all terms by x2: 20 -x = x2 Subtract x2 from both sides: 20 -x -x2 = 0 Divide all terms by -1 and form a quadratic equation: x2+x-20 = 0 Factor the equation: (x+5)(x-4) = 0 Solution: x = -5 or x = 4