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Simplifying
3x(4x + 3x) = 21
Combine like terms: 4x + 3x = 7x
3x(7x) = 21
Remove parenthesis around (7x)
3x * 7x = 21
Reorder the terms for easier multiplication:
3 * 7x * x = 21
Multiply 3 * 7
21x * x = 21
Multiply x * x
21x2 = 21
Solving
21x2 = 21
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Divide each side by '21'.
x2 = 1
Simplifying
x2 = 1
Take the square root of each side:
x = {-1, 1}
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