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Simplifying (4x + -18) + (7x + 9) = 90 Reorder the terms: (-18 + 4x) + (7x + 9) = 90 Remove parenthesis around (-18 + 4x) -18 + 4x + (7x + 9) = 90 Reorder the terms: -18 + 4x + (9 + 7x) = 90 Remove parenthesis around (9 + 7x) -18 + 4x + 9 + 7x = 90 Reorder the terms: -18 + 9 + 4x + 7x = 90 Combine like terms: -18 + 9 = -9 -9 + 4x + 7x = 90 Combine like terms: 4x + 7x = 11x -9 + 11x = 90 Solving -9 + 11x = 90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + 11x = 90 + 9 Combine like terms: -9 + 9 = 0 0 + 11x = 90 + 9 11x = 90 + 9 Combine like terms: 90 + 9 = 99 11x = 99 Divide each side by '11'. x = 9 Simplifying x = 9
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