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Simplifying 3x + -7 + x + 13 = 90 Reorder the terms: -7 + 13 + 3x + x = 90 Combine like terms: -7 + 13 = 6 6 + 3x + x = 90 Combine like terms: 3x + x = 4x 6 + 4x = 90 Solving 6 + 4x = 90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-6' to each side of the equation. 6 + -6 + 4x = 90 + -6 Combine like terms: 6 + -6 = 0 0 + 4x = 90 + -6 4x = 90 + -6 Combine like terms: 90 + -6 = 84 4x = 84 Divide each side by '4'. x = 21 Simplifying x = 21
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