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Simplifying 3(-3(x + -1x) + -4x) = 9x + 21 Combine like terms: x + -1x = 0 3(-3(0) + -4x) = 9x + 21 Multiply -3 * 0 3(0 + -4x) = 9x + 21 Anything times zero is zero. 3(0 + -4x) = 9x + 21 Remove the zero: 3(-4x) = 9x + 21 Remove parenthesis around (-4x) 3 * -4x = 9x + 21 Multiply 3 * -4 -12x = 9x + 21 Reorder the terms: -12x = 21 + 9x Solving -12x = 21 + 9x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-9x' to each side of the equation. -12x + -9x = 21 + 9x + -9x Combine like terms: -12x + -9x = -21x -21x = 21 + 9x + -9x Combine like terms: 9x + -9x = 0 -21x = 21 + 0 -21x = 21 Divide each side by '-21'. x = -1 Simplifying x = -1
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