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Simplifying 3(21 + -4y) + 7y = 28 (21 * 3 + -4y * 3) + 7y = 28 (63 + -12y) + 7y = 28 Combine like terms: -12y + 7y = -5y 63 + -5y = 28 Solving 63 + -5y = 28 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-63' to each side of the equation. 63 + -63 + -5y = 28 + -63 Combine like terms: 63 + -63 = 0 0 + -5y = 28 + -63 -5y = 28 + -63 Combine like terms: 28 + -63 = -35 -5y = -35 Divide each side by '-5'. y = 7 Simplifying y = 7
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