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Simplifying 90 + 9x = 7(x + 30) Reorder the terms: 90 + 9x = 7(30 + x) 90 + 9x = (30 * 7 + x * 7) 90 + 9x = (210 + 7x) Solving 90 + 9x = 210 + 7x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7x' to each side of the equation. 90 + 9x + -7x = 210 + 7x + -7x Combine like terms: 9x + -7x = 2x 90 + 2x = 210 + 7x + -7x Combine like terms: 7x + -7x = 0 90 + 2x = 210 + 0 90 + 2x = 210 Add '-90' to each side of the equation. 90 + -90 + 2x = 210 + -90 Combine like terms: 90 + -90 = 0 0 + 2x = 210 + -90 2x = 210 + -90 Combine like terms: 210 + -90 = 120 2x = 120 Divide each side by '2'. x = 60 Simplifying x = 60
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