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Simplifying 13x + -21 + 3x + 63 = 90 Reorder the terms: -21 + 63 + 13x + 3x = 90 Combine like terms: -21 + 63 = 42 42 + 13x + 3x = 90 Combine like terms: 13x + 3x = 16x 42 + 16x = 90 Solving 42 + 16x = 90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-42' to each side of the equation. 42 + -42 + 16x = 90 + -42 Combine like terms: 42 + -42 = 0 0 + 16x = 90 + -42 16x = 90 + -42 Combine like terms: 90 + -42 = 48 16x = 48 Divide each side by '16'. x = 3 Simplifying x = 3
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