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Simplifying
x2 + 7x2 = 128
Combine like terms: x2 + 7x2 = 8x2
8x2 = 128
Solving
8x2 = 128
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Divide each side by '8'.
x2 = 16
Simplifying
x2 = 16
Take the square root of each side:
x = {-4, 4}
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