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Simplifying (7x + 14) + (21x) = 90 Reorder the terms: (14 + 7x) + (21x) = 90 Remove parenthesis around (14 + 7x) 14 + 7x + (21x) = 90 Combine like terms: 7x + (21x) = 28x 14 + 28x = 90 Solving 14 + 28x = 90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-14' to each side of the equation. 14 + -14 + 28x = 90 + -14 Combine like terms: 14 + -14 = 0 0 + 28x = 90 + -14 28x = 90 + -14 Combine like terms: 90 + -14 = 76 28x = 76 Divide each side by '28'. x = 2.714285714 Simplifying x = 2.714285714
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