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Simplifying 3x + -9 + (x + 7) = 90 Reorder the terms: 3x + -9 + (7 + x) = 90 Remove parenthesis around (7 + x) 3x + -9 + 7 + x = 90 Reorder the terms: -9 + 7 + 3x + x = 90 Combine like terms: -9 + 7 = -2 -2 + 3x + x = 90 Combine like terms: 3x + x = 4x -2 + 4x = 90 Solving -2 + 4x = 90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + 4x = 90 + 2 Combine like terms: -2 + 2 = 0 0 + 4x = 90 + 2 4x = 90 + 2 Combine like terms: 90 + 2 = 92 4x = 92 Divide each side by '4'. x = 23 Simplifying x = 23
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