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Simplifying 2x + -3(4x + -3) = 21 Reorder the terms: 2x + -3(-3 + 4x) = 21 2x + (-3 * -3 + 4x * -3) = 21 2x + (9 + -12x) = 21 Reorder the terms: 9 + 2x + -12x = 21 Combine like terms: 2x + -12x = -10x 9 + -10x = 21 Solving 9 + -10x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + -10x = 21 + -9 Combine like terms: 9 + -9 = 0 0 + -10x = 21 + -9 -10x = 21 + -9 Combine like terms: 21 + -9 = 12 -10x = 12 Divide each side by '-10'. x = -1.2 Simplifying x = -1.2
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