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Simplifying -5x + -1(2x + 12) = 21 Reorder the terms: -5x + -1(12 + 2x) = 21 -5x + (12 * -1 + 2x * -1) = 21 -5x + (-12 + -2x) = 21 Reorder the terms: -12 + -5x + -2x = 21 Combine like terms: -5x + -2x = -7x -12 + -7x = 21 Solving -12 + -7x = 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 + -7x = 21 + 12 Combine like terms: -12 + 12 = 0 0 + -7x = 21 + 12 -7x = 21 + 12 Combine like terms: 21 + 12 = 33 -7x = 33 Divide each side by '-7'. x = -4.714285714 Simplifying x = -4.714285714
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