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Simplifying 4x + -1(2 + -2x) + 15 = 55 4x + (2 * -1 + -2x * -1) + 15 = 55 4x + (-2 + 2x) + 15 = 55 Reorder the terms: -2 + 15 + 4x + 2x = 55 Combine like terms: -2 + 15 = 13 13 + 4x + 2x = 55 Combine like terms: 4x + 2x = 6x 13 + 6x = 55 Solving 13 + 6x = 55 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-13' to each side of the equation. 13 + -13 + 6x = 55 + -13 Combine like terms: 13 + -13 = 0 0 + 6x = 55 + -13 6x = 55 + -13 Combine like terms: 55 + -13 = 42 6x = 42 Divide each side by '6'. x = 7 Simplifying x = 7
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