9x^2-7x^2=18

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Solution for 9x^2-7x^2=18 equation: 


Simplifying
9x2 + -7x2 = 18

Combine like terms: 9x2 + -7x2 = 2x2
2x2 = 18

Solving
2x2 = 18

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Divide each side by '2'.
x2 = 9

Simplifying
x2 = 9

Take the square root of each side:
x = {-3, 3}

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