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Simplifying
3(x2 + -10) = 90
Reorder the terms:
3(-10 + x2) = 90
(-10 * 3 + x2 * 3) = 90
(-30 + 3x2) = 90
Solving
-30 + 3x2 = 90
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '30' to each side of the equation.
-30 + 30 + 3x2 = 90 + 30
Combine like terms: -30 + 30 = 0
0 + 3x2 = 90 + 30
3x2 = 90 + 30
Combine like terms: 90 + 30 = 120
3x2 = 120
Divide each side by '3'.
x2 = 40
Simplifying
x2 = 40
Take the square root of each side:
x = {-6.32455532, 6.32455532}
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