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Simplifying -9 * 21 + -7y = 63 Multiply -9 * 21 -189 + -7y = 63 Solving -189 + -7y = 63 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '189' to each side of the equation. -189 + 189 + -7y = 63 + 189 Combine like terms: -189 + 189 = 0 0 + -7y = 63 + 189 -7y = 63 + 189 Combine like terms: 63 + 189 = 252 -7y = 252 Divide each side by '-7'. y = -36 Simplifying y = -36
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