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Simplifying 7x + -10 + 9x + -12 = 90 Reorder the terms: -10 + -12 + 7x + 9x = 90 Combine like terms: -10 + -12 = -22 -22 + 7x + 9x = 90 Combine like terms: 7x + 9x = 16x -22 + 16x = 90 Solving -22 + 16x = 90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '22' to each side of the equation. -22 + 22 + 16x = 90 + 22 Combine like terms: -22 + 22 = 0 0 + 16x = 90 + 22 16x = 90 + 22 Combine like terms: 90 + 22 = 112 16x = 112 Divide each side by '16'. x = 7 Simplifying x = 7
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