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