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Simplifying 3(x + -12) = 21x Reorder the terms: 3(-12 + x) = 21x (-12 * 3 + x * 3) = 21x (-36 + 3x) = 21x Solving -36 + 3x = 21x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-21x' to each side of the equation. -36 + 3x + -21x = 21x + -21x Combine like terms: 3x + -21x = -18x -36 + -18x = 21x + -21x Combine like terms: 21x + -21x = 0 -36 + -18x = 0 Add '36' to each side of the equation. -36 + 36 + -18x = 0 + 36 Combine like terms: -36 + 36 = 0 0 + -18x = 0 + 36 -18x = 0 + 36 Combine like terms: 0 + 36 = 36 -18x = 36 Divide each side by '-18'. x = -2 Simplifying x = -2
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