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Simplifying 7x + -1(2x + -7) = 28 Reorder the terms: 7x + -1(-7 + 2x) = 28 7x + (-7 * -1 + 2x * -1) = 28 7x + (7 + -2x) = 28 Reorder the terms: 7 + 7x + -2x = 28 Combine like terms: 7x + -2x = 5x 7 + 5x = 28 Solving 7 + 5x = 28 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 + 5x = 28 + -7 Combine like terms: 7 + -7 = 0 0 + 5x = 28 + -7 5x = 28 + -7 Combine like terms: 28 + -7 = 21 5x = 21 Divide each side by '5'. x = 4.2 Simplifying x = 4.2
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