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Simplifying
(3x2) + -75 = 0
Reorder the terms:
-75 + (3x2) = 0
Solving
-75 + (3x2) = 0
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '75' to each side of the equation.
-75 + 75 + (3x2) = 0 + 75
Combine like terms: -75 + 75 = 0
0 + (3x2) = 0 + 75
(3x2) = 0 + 75
Combine like terms: 0 + 75 = 75
(3x2) = 75
Divide each side by '3'.
x2 = 25
Simplifying
x2 = 25
Take the square root of each side:
x = {-5, 5}
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