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Simplifying 3(x + -6) + -21 = x + -4 Reorder the terms: 3(-6 + x) + -21 = x + -4 (-6 * 3 + x * 3) + -21 = x + -4 (-18 + 3x) + -21 = x + -4 Reorder the terms: -18 + -21 + 3x = x + -4 Combine like terms: -18 + -21 = -39 -39 + 3x = x + -4 Reorder the terms: -39 + 3x = -4 + x Solving -39 + 3x = -4 + 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. -39 + 3x + -1x = -4 + x + -1x Combine like terms: 3x + -1x = 2x -39 + 2x = -4 + x + -1x Combine like terms: x + -1x = 0 -39 + 2x = -4 + 0 -39 + 2x = -4 Add '39' to each side of the equation. -39 + 39 + 2x = -4 + 39 Combine like terms: -39 + 39 = 0 0 + 2x = -4 + 39 2x = -4 + 39 Combine like terms: -4 + 39 = 35 2x = 35 Divide each side by '2'. x = 17.5 Simplifying x = 17.5
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