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Simplifying 40x + 3(2x) = 644 Remove parenthesis around (2x) 40x + 3 * 2x = 644 Multiply 3 * 2 40x + 6x = 644 Combine like terms: 40x + 6x = 46x 46x = 644 Solving 46x = 644 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Divide each side by '46'. x = 14 Simplifying x = 14
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