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Simplifying -7(21 + 2y) + -2y = -13 (21 * -7 + 2y * -7) + -2y = -13 (-147 + -14y) + -2y = -13 Combine like terms: -14y + -2y = -16y -147 + -16y = -13 Solving -147 + -16y = -13 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '147' to each side of the equation. -147 + 147 + -16y = -13 + 147 Combine like terms: -147 + 147 = 0 0 + -16y = -13 + 147 -16y = -13 + 147 Combine like terms: -13 + 147 = 134 -16y = 134 Divide each side by '-16'. y = -8.375 Simplifying y = -8.375
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