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Simplifying 7(3 + x) = 2(4x + 5) (3 * 7 + x * 7) = 2(4x + 5) (21 + 7x) = 2(4x + 5) Reorder the terms: 21 + 7x = 2(5 + 4x) 21 + 7x = (5 * 2 + 4x * 2) 21 + 7x = (10 + 8x) Solving 21 + 7x = 10 + 8x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-8x' to each side of the equation. 21 + 7x + -8x = 10 + 8x + -8x Combine like terms: 7x + -8x = -1x 21 + -1x = 10 + 8x + -8x Combine like terms: 8x + -8x = 0 21 + -1x = 10 + 0 21 + -1x = 10 Add '-21' to each side of the equation. 21 + -21 + -1x = 10 + -21 Combine like terms: 21 + -21 = 0 0 + -1x = 10 + -21 -1x = 10 + -21 Combine like terms: 10 + -21 = -11 -1x = -11 Divide each side by '-1'. x = 11 Simplifying x = 11
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