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Simplifying 28(5x + 2) = 21(7x) Reorder the terms: 28(2 + 5x) = 21(7x) (2 * 28 + 5x * 28) = 21(7x) (56 + 140x) = 21(7x) Remove parenthesis around (7x) 56 + 140x = 21 * 7x Multiply 21 * 7 56 + 140x = 147x Solving 56 + 140x = 147x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-147x' to each side of the equation. 56 + 140x + -147x = 147x + -147x Combine like terms: 140x + -147x = -7x 56 + -7x = 147x + -147x Combine like terms: 147x + -147x = 0 56 + -7x = 0 Add '-56' to each side of the equation. 56 + -56 + -7x = 0 + -56 Combine like terms: 56 + -56 = 0 0 + -7x = 0 + -56 -7x = 0 + -56 Combine like terms: 0 + -56 = -56 -7x = -56 Divide each side by '-7'. x = 8 Simplifying x = 8
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