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