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Simplifying 2(-1) + -1y = 7 Multiply 2 * -1 -2 + -1y = 7 Solving -2 + -1y = 7 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + -1y = 7 + 2 Combine like terms: -2 + 2 = 0 0 + -1y = 7 + 2 -1y = 7 + 2 Combine like terms: 7 + 2 = 9 -1y = 9 Divide each side by '-1'. y = -9 Simplifying y = -9
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