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Simplifying -7(3y + -1) + 4y = -129 Reorder the terms: -7(-1 + 3y) + 4y = -129 (-1 * -7 + 3y * -7) + 4y = -129 (7 + -21y) + 4y = -129 Combine like terms: -21y + 4y = -17y 7 + -17y = -129 Solving 7 + -17y = -129 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 + -17y = -129 + -7 Combine like terms: 7 + -7 = 0 0 + -17y = -129 + -7 -17y = -129 + -7 Combine like terms: -129 + -7 = -136 -17y = -136 Divide each side by '-17'. y = 8 Simplifying y = 8
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