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Simplifying 12x + 9y + -1(12x + 8y) = 132 + -1(128) 12x + 9y + (12x * -1 + 8y * -1) = 132 + -1(128) 12x + 9y + (-12x + -8y) = 132 + -1(128) Reorder the terms: 12x + -12x + 9y + -8y = 132 + -1(128) Combine like terms: 12x + -12x = 0 0 + 9y + -8y = 132 + -1(128) 9y + -8y = 132 + -1(128) Combine like terms: 9y + -8y = 1y 1y = 132 + -1(128) Multiply -1 * 128 1y = 132 + -128 Combine like terms: 132 + -128 = 4 1y = 4 Solving 1y = 4 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Divide each side by '1'. y = 4 Simplifying y = 4
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