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Simplifying
27x2 + 18x2 = 0
Combine like terms: 27x2 + 18x2 = 45x2
45x2 = 0
Solving
45x2 = 0
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Divide each side by '45'.
x2 = 0
Simplifying
x2 = 0
Take the square root of each side:
x = {0}
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