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Simplifying (7x + -4) + (9x + -28) = 90 Reorder the terms: (-4 + 7x) + (9x + -28) = 90 Remove parenthesis around (-4 + 7x) -4 + 7x + (9x + -28) = 90 Reorder the terms: -4 + 7x + (-28 + 9x) = 90 Remove parenthesis around (-28 + 9x) -4 + 7x + -28 + 9x = 90 Reorder the terms: -4 + -28 + 7x + 9x = 90 Combine like terms: -4 + -28 = -32 -32 + 7x + 9x = 90 Combine like terms: 7x + 9x = 16x -32 + 16x = 90 Solving -32 + 16x = 90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '32' to each side of the equation. -32 + 32 + 16x = 90 + 32 Combine like terms: -32 + 32 = 0 0 + 16x = 90 + 32 16x = 90 + 32 Combine like terms: 90 + 32 = 122 16x = 122 Divide each side by '16'. x = 7.625 Simplifying x = 7.625
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