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Simplifying 28(x + 5) = 21(2x) Reorder the terms: 28(5 + x) = 21(2x) (5 * 28 + x * 28) = 21(2x) (140 + 28x) = 21(2x) Remove parenthesis around (2x) 140 + 28x = 21 * 2x Multiply 21 * 2 140 + 28x = 42x Solving 140 + 28x = 42x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-42x' to each side of the equation. 140 + 28x + -42x = 42x + -42x Combine like terms: 28x + -42x = -14x 140 + -14x = 42x + -42x Combine like terms: 42x + -42x = 0 140 + -14x = 0 Add '-140' to each side of the equation. 140 + -140 + -14x = 0 + -140 Combine like terms: 140 + -140 = 0 0 + -14x = 0 + -140 -14x = 0 + -140 Combine like terms: 0 + -140 = -140 -14x = -140 Divide each side by '-14'. x = 10 Simplifying x = 10
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