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Simplifying 3(y + -3) = 7y + -21 Reorder the terms: 3(-3 + y) = 7y + -21 (-3 * 3 + y * 3) = 7y + -21 (-9 + 3y) = 7y + -21 Reorder the terms: -9 + 3y = -21 + 7y Solving -9 + 3y = -21 + 7y Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-7y' to each side of the equation. -9 + 3y + -7y = -21 + 7y + -7y Combine like terms: 3y + -7y = -4y -9 + -4y = -21 + 7y + -7y Combine like terms: 7y + -7y = 0 -9 + -4y = -21 + 0 -9 + -4y = -21 Add '9' to each side of the equation. -9 + 9 + -4y = -21 + 9 Combine like terms: -9 + 9 = 0 0 + -4y = -21 + 9 -4y = -21 + 9 Combine like terms: -21 + 9 = -12 -4y = -12 Divide each side by '-4'. y = 3 Simplifying y = 3
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