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Simplifying 7 + -1(-1y) = 21 Remove parenthesis around (-1y) 7 + -1 * -1y = 21 Multiply -1 * -1 7 + 1y = 21 Solving 7 + 1y = 21 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + 1y = 21 + -7 Combine like terms: 7 + -7 = 0 0 + 1y = 21 + -7 1y = 21 + -7 Combine like terms: 21 + -7 = 14 1y = 14 Divide each side by '1'. y = 14 Simplifying y = 14
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