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Simplifying (x + 7) + -3x = 21.5 Reorder the terms: (7 + x) + -3x = 21.5 Remove parenthesis around (7 + x) 7 + x + -3x = 21.5 Combine like terms: x + -3x = -2x 7 + -2x = 21.5 Solving 7 + -2x = 21.5 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + -2x = 21.5 + -7 Combine like terms: 7 + -7 = 0 0 + -2x = 21.5 + -7 -2x = 21.5 + -7 Combine like terms: 21.5 + -7 = 14.5 -2x = 14.5 Divide each side by '-2'. x = -7.25 Simplifying x = -7.25
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