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Simplifying (7x + 5) = (3x + 21) Reorder the terms: (5 + 7x) = (3x + 21) Remove parenthesis around (5 + 7x) 5 + 7x = (3x + 21) Reorder the terms: 5 + 7x = (21 + 3x) Remove parenthesis around (21 + 3x) 5 + 7x = 21 + 3x Solving 5 + 7x = 21 + 3x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3x' to each side of the equation. 5 + 7x + -3x = 21 + 3x + -3x Combine like terms: 7x + -3x = 4x 5 + 4x = 21 + 3x + -3x Combine like terms: 3x + -3x = 0 5 + 4x = 21 + 0 5 + 4x = 21 Add '-5' to each side of the equation. 5 + -5 + 4x = 21 + -5 Combine like terms: 5 + -5 = 0 0 + 4x = 21 + -5 4x = 21 + -5 Combine like terms: 21 + -5 = 16 4x = 16 Divide each side by '4'. x = 4 Simplifying x = 4
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