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Simplifying 90 = 2x + 5x + -1 Reorder the terms: 90 = -1 + 2x + 5x Combine like terms: 2x + 5x = 7x 90 = -1 + 7x Solving 90 = -1 + 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 + -7x = -1 + 7x + -7x Combine like terms: 7x + -7x = 0 90 + -7x = -1 + 0 90 + -7x = -1 Add '-90' to each side of the equation. 90 + -90 + -7x = -1 + -90 Combine like terms: 90 + -90 = 0 0 + -7x = -1 + -90 -7x = -1 + -90 Combine like terms: -1 + -90 = -91 -7x = -91 Divide each side by '-7'. x = 13 Simplifying x = 13
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