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Simplifying 3x + -3(-15 + -6x) = -18 3x + (-15 * -3 + -6x * -3) = -18 3x + (45 + 18x) = -18 Reorder the terms: 45 + 3x + 18x = -18 Combine like terms: 3x + 18x = 21x 45 + 21x = -18 Solving 45 + 21x = -18 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-45' to each side of the equation. 45 + -45 + 21x = -18 + -45 Combine like terms: 45 + -45 = 0 0 + 21x = -18 + -45 21x = -18 + -45 Combine like terms: -18 + -45 = -63 21x = -63 Divide each side by '21'. x = -3 Simplifying x = -3
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