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