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Simplifying 3x + 4(3x + -13) = 128 Reorder the terms: 3x + 4(-13 + 3x) = 128 3x + (-13 * 4 + 3x * 4) = 128 3x + (-52 + 12x) = 128 Reorder the terms: -52 + 3x + 12x = 128 Combine like terms: 3x + 12x = 15x -52 + 15x = 128 Solving -52 + 15x = 128 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '52' to each side of the equation. -52 + 52 + 15x = 128 + 52 Combine like terms: -52 + 52 = 0 0 + 15x = 128 + 52 15x = 128 + 52 Combine like terms: 128 + 52 = 180 15x = 180 Divide each side by '15'. x = 12 Simplifying x = 12
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