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Simplifying x + (23 + x) + (-30 + 2x) = 549 Remove parenthesis around (23 + x) x + 23 + x + (-30 + 2x) = 549 Remove parenthesis around (-30 + 2x) x + 23 + x + -30 + 2x = 549 Reorder the terms: 23 + -30 + x + x + 2x = 549 Combine like terms: 23 + -30 = -7 -7 + x + x + 2x = 549 Combine like terms: x + x = 2x -7 + 2x + 2x = 549 Combine like terms: 2x + 2x = 4x -7 + 4x = 549 Solving -7 + 4x = 549 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 + 4x = 549 + 7 Combine like terms: -7 + 7 = 0 0 + 4x = 549 + 7 4x = 549 + 7 Combine like terms: 549 + 7 = 556 4x = 556 Divide each side by '4'. x = 139 Simplifying x = 139
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