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Simplifying
28 = 3x2 + 1
Reorder the terms:
28 = 1 + 3x2
Solving
28 = 1 + 3x2
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '-3x2' to each side of the equation.
28 + -3x2 = 1 + 3x2 + -3x2
Combine like terms: 3x2 + -3x2 = 0
28 + -3x2 = 1 + 0
28 + -3x2 = 1
Add '-28' to each side of the equation.
28 + -28 + -3x2 = 1 + -28
Combine like terms: 28 + -28 = 0
0 + -3x2 = 1 + -28
-3x2 = 1 + -28
Combine like terms: 1 + -28 = -27
-3x2 = -27
Divide each side by '-3'.
x2 = 9
Simplifying
x2 = 9
Take the square root of each side:
x = {-3, 3}
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