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Simplifying -2(x + 4) + -21x = 72 Reorder the terms: -2(4 + x) + -21x = 72 (4 * -2 + x * -2) + -21x = 72 (-8 + -2x) + -21x = 72 Combine like terms: -2x + -21x = -23x -8 + -23x = 72 Solving -8 + -23x = 72 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '8' to each side of the equation. -8 + 8 + -23x = 72 + 8 Combine like terms: -8 + 8 = 0 0 + -23x = 72 + 8 -23x = 72 + 8 Combine like terms: 72 + 8 = 80 -23x = 80 Divide each side by '-23'. x = -3.47826087 Simplifying x = -3.47826087
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