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Simplifying -8x + 2(-21 + -5x) = 12 -8x + (-21 * 2 + -5x * 2) = 12 -8x + (-42 + -10x) = 12 Reorder the terms: -42 + -8x + -10x = 12 Combine like terms: -8x + -10x = -18x -42 + -18x = 12 Solving -42 + -18x = 12 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '42' to each side of the equation. -42 + 42 + -18x = 12 + 42 Combine like terms: -42 + 42 = 0 0 + -18x = 12 + 42 -18x = 12 + 42 Combine like terms: 12 + 42 = 54 -18x = 54 Divide each side by '-18'. x = -3 Simplifying x = -3
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