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Simplifying 7x + 21 + (2x + -3) = 180 Reorder the terms: 7x + 21 + (-3 + 2x) = 180 Remove parenthesis around (-3 + 2x) 7x + 21 + -3 + 2x = 180 Reorder the terms: 21 + -3 + 7x + 2x = 180 Combine like terms: 21 + -3 = 18 18 + 7x + 2x = 180 Combine like terms: 7x + 2x = 9x 18 + 9x = 180 Solving 18 + 9x = 180 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-18' to each side of the equation. 18 + -18 + 9x = 180 + -18 Combine like terms: 18 + -18 = 0 0 + 9x = 180 + -18 9x = 180 + -18 Combine like terms: 180 + -18 = 162 9x = 162 Divide each side by '9'. x = 18 Simplifying x = 18
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