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Simplifying 5(x + -3) + -2x = 21 Reorder the terms: 5(-3 + x) + -2x = 21 (-3 * 5 + x * 5) + -2x = 21 (-15 + 5x) + -2x = 21 Combine like terms: 5x + -2x = 3x -15 + 3x = 21 Solving -15 + 3x = 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 + 3x = 21 + 15 Combine like terms: -15 + 15 = 0 0 + 3x = 21 + 15 3x = 21 + 15 Combine like terms: 21 + 15 = 36 3x = 36 Divide each side by '3'. x = 12 Simplifying x = 12
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