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Simplifying
3X2 + -18 = 282
Reorder the terms:
-18 + 3X2 = 282
Solving
-18 + 3X2 = 282
Solving for variable 'X'.
Move all terms containing X to the left, all other terms to the right.
Add '18' to each side of the equation.
-18 + 18 + 3X2 = 282 + 18
Combine like terms: -18 + 18 = 0
0 + 3X2 = 282 + 18
3X2 = 282 + 18
Combine like terms: 282 + 18 = 300
3X2 = 300
Divide each side by '3'.
X2 = 100
Simplifying
X2 = 100
Take the square root of each side:
X = {-10, 10}
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