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Simplifying x + 3x + 7 = 90 Reorder the terms: 7 + x + 3x = 90 Combine like terms: x + 3x = 4x 7 + 4x = 90 Solving 7 + 4x = 90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + 4x = 90 + -7 Combine like terms: 7 + -7 = 0 0 + 4x = 90 + -7 4x = 90 + -7 Combine like terms: 90 + -7 = 83 4x = 83 Divide each side by '4'. x = 20.75 Simplifying x = 20.75
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