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Simplifying -2x + -66 = x + 21 Reorder the terms: -66 + -2x = x + 21 Reorder the terms: -66 + -2x = 21 + x Solving -66 + -2x = 21 + x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1x' to each side of the equation. -66 + -2x + -1x = 21 + x + -1x Combine like terms: -2x + -1x = -3x -66 + -3x = 21 + x + -1x Combine like terms: x + -1x = 0 -66 + -3x = 21 + 0 -66 + -3x = 21 Add '66' to each side of the equation. -66 + 66 + -3x = 21 + 66 Combine like terms: -66 + 66 = 0 0 + -3x = 21 + 66 -3x = 21 + 66 Combine like terms: 21 + 66 = 87 -3x = 87 Divide each side by '-3'. x = -29 Simplifying x = -29
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