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Simplifying
9x2 + 15 = 40
Reorder the terms:
15 + 9x2 = 40
Solving
15 + 9x2 = 40
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 + 9x2 = 40 + -15
Combine like terms: 15 + -15 = 0
0 + 9x2 = 40 + -15
9x2 = 40 + -15
Combine like terms: 40 + -15 = 25
9x2 = 25
Divide each side by '9'.
x2 = 2.777777778
Simplifying
x2 = 2.777777778
Take the square root of each side:
x = {-1.666666667, 1.666666667}
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