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Simplifying 7 + -1(-4y) = 4t + -14 + -21t Remove parenthesis around (-4y) 7 + -1 * -4y = 4t + -14 + -21t Multiply -1 * -4 7 + 4y = 4t + -14 + -21t Reorder the terms: 7 + 4y = -14 + 4t + -21t Combine like terms: 4t + -21t = -17t 7 + 4y = -14 + -17t Solving 7 + 4y = -14 + -17t 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 + 4y = -14 + -7 + -17t Combine like terms: 7 + -7 = 0 0 + 4y = -14 + -7 + -17t 4y = -14 + -7 + -17t Combine like terms: -14 + -7 = -21 4y = -21 + -17t Divide each side by '4'. y = -5.25 + -4.25t Simplifying y = -5.25 + -4.25t
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