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Simplifying
3(x2 + -5) = 9
Reorder the terms:
3(-5 + x2) = 9
(-5 * 3 + x2 * 3) = 9
(-15 + 3x2) = 9
Solving
-15 + 3x2 = 9
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '15' to each side of the equation.
-15 + 15 + 3x2 = 9 + 15
Combine like terms: -15 + 15 = 0
0 + 3x2 = 9 + 15
3x2 = 9 + 15
Combine like terms: 9 + 15 = 24
3x2 = 24
Divide each side by '3'.
x2 = 8
Simplifying
x2 = 8
Take the square root of each side:
x = {-2.828427125, 2.828427125}
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