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Simplifying 90 = x + 3x + 18 Reorder the terms: 90 = 18 + x + 3x Combine like terms: x + 3x = 4x 90 = 18 + 4x Solving 90 = 18 + 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 = 18 + 4x + -4x Combine like terms: 4x + -4x = 0 90 + -4x = 18 + 0 90 + -4x = 18 Add '-90' to each side of the equation. 90 + -90 + -4x = 18 + -90 Combine like terms: 90 + -90 = 0 0 + -4x = 18 + -90 -4x = 18 + -90 Combine like terms: 18 + -90 = -72 -4x = -72 Divide each side by '-4'. x = 18 Simplifying x = 18
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