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Simplifying x + -5(x + -3) = 21 Reorder the terms: x + -5(-3 + x) = 21 x + (-3 * -5 + x * -5) = 21 x + (15 + -5x) = 21 Reorder the terms: 15 + x + -5x = 21 Combine like terms: x + -5x = -4x 15 + -4x = 21 Solving 15 + -4x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-15' to each side of the equation. 15 + -15 + -4x = 21 + -15 Combine like terms: 15 + -15 = 0 0 + -4x = 21 + -15 -4x = 21 + -15 Combine like terms: 21 + -15 = 6 -4x = 6 Divide each side by '-4'. x = -1.5 Simplifying x = -1.5
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