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Simplifying x + (x + 30) + (x + -7) = 320 Reorder the terms: x + (30 + x) + (x + -7) = 320 Remove parenthesis around (30 + x) x + 30 + x + (x + -7) = 320 Reorder the terms: x + 30 + x + (-7 + x) = 320 Remove parenthesis around (-7 + x) x + 30 + x + -7 + x = 320 Reorder the terms: 30 + -7 + x + x + x = 320 Combine like terms: 30 + -7 = 23 23 + x + x + x = 320 Combine like terms: x + x = 2x 23 + 2x + x = 320 Combine like terms: 2x + x = 3x 23 + 3x = 320 Solving 23 + 3x = 320 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-23' to each side of the equation. 23 + -23 + 3x = 320 + -23 Combine like terms: 23 + -23 = 0 0 + 3x = 320 + -23 3x = 320 + -23 Combine like terms: 320 + -23 = 297 3x = 297 Divide each side by '3'. x = 99 Simplifying x = 99
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