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Simplifying 6x + -1(2x + -7) = 55 Reorder the terms: 6x + -1(-7 + 2x) = 55 6x + (-7 * -1 + 2x * -1) = 55 6x + (7 + -2x) = 55 Reorder the terms: 7 + 6x + -2x = 55 Combine like terms: 6x + -2x = 4x 7 + 4x = 55 Solving 7 + 4x = 55 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + 4x = 55 + -7 Combine like terms: 7 + -7 = 0 0 + 4x = 55 + -7 4x = 55 + -7 Combine like terms: 55 + -7 = 48 4x = 48 Divide each side by '4'. x = 12 Simplifying x = 12
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