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Simplifying -3(5x + -4) = 21 Reorder the terms: -3(-4 + 5x) = 21 (-4 * -3 + 5x * -3) = 21 (12 + -15x) = 21 Solving 12 + -15x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-12' to each side of the equation. 12 + -12 + -15x = 21 + -12 Combine like terms: 12 + -12 = 0 0 + -15x = 21 + -12 -15x = 21 + -12 Combine like terms: 21 + -12 = 9 -15x = 9 Divide each side by '-15'. x = -0.6 Simplifying x = -0.6
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