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Simplifying 21 + 3(x + -4) = (x + 5) Reorder the terms: 21 + 3(-4 + x) = (x + 5) 21 + (-4 * 3 + x * 3) = (x + 5) 21 + (-12 + 3x) = (x + 5) Combine like terms: 21 + -12 = 9 9 + 3x = (x + 5) Reorder the terms: 9 + 3x = (5 + x) Remove parenthesis around (5 + x) 9 + 3x = 5 + x Solving 9 + 3x = 5 + 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. 9 + 3x + -1x = 5 + x + -1x Combine like terms: 3x + -1x = 2x 9 + 2x = 5 + x + -1x Combine like terms: x + -1x = 0 9 + 2x = 5 + 0 9 + 2x = 5 Add '-9' to each side of the equation. 9 + -9 + 2x = 5 + -9 Combine like terms: 9 + -9 = 0 0 + 2x = 5 + -9 2x = 5 + -9 Combine like terms: 5 + -9 = -4 2x = -4 Divide each side by '2'. x = -2 Simplifying x = -2
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