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Simplifying 21 + -1(x + 3) = (x + 4) Reorder the terms: 21 + -1(3 + x) = (x + 4) 21 + (3 * -1 + x * -1) = (x + 4) 21 + (-3 + -1x) = (x + 4) Combine like terms: 21 + -3 = 18 18 + -1x = (x + 4) Reorder the terms: 18 + -1x = (4 + x) Remove parenthesis around (4 + x) 18 + -1x = 4 + x Solving 18 + -1x = 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. 18 + -1x + -1x = 4 + x + -1x Combine like terms: -1x + -1x = -2x 18 + -2x = 4 + x + -1x Combine like terms: x + -1x = 0 18 + -2x = 4 + 0 18 + -2x = 4 Add '-18' to each side of the equation. 18 + -18 + -2x = 4 + -18 Combine like terms: 18 + -18 = 0 0 + -2x = 4 + -18 -2x = 4 + -18 Combine like terms: 4 + -18 = -14 -2x = -14 Divide each side by '-2'. x = 7 Simplifying x = 7
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