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Simplifying 7x + 4[3x + -9] = 135 Reorder the terms: 7x + 4[-9 + 3x] = 135 7x + [-9 * 4 + 3x * 4] = 135 7x + [-36 + 12x] = 135 Reorder the terms: -36 + 7x + 12x = 135 Combine like terms: 7x + 12x = 19x -36 + 19x = 135 Solving -36 + 19x = 135 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '36' to each side of the equation. -36 + 36 + 19x = 135 + 36 Combine like terms: -36 + 36 = 0 0 + 19x = 135 + 36 19x = 135 + 36 Combine like terms: 135 + 36 = 171 19x = 171 Divide each side by '19'. x = 9 Simplifying x = 9
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