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Simplifying 3x + 4 + -1(-4x) = 39 Remove parenthesis around (-4x) 3x + 4 + -1 * -4x = 39 Multiply -1 * -4 3x + 4 + 4x = 39 Reorder the terms: 4 + 3x + 4x = 39 Combine like terms: 3x + 4x = 7x 4 + 7x = 39 Solving 4 + 7x = 39 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + 7x = 39 + -4 Combine like terms: 4 + -4 = 0 0 + 7x = 39 + -4 7x = 39 + -4 Combine like terms: 39 + -4 = 35 7x = 35 Divide each side by '7'. x = 5 Simplifying x = 5
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