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Simplifying (7.5 + -0.4y) + y = 90 Remove parenthesis around (7.5 + -0.4y) 7.5 + -0.4y + y = 90 Combine like terms: -0.4y + y = 0.6y 7.5 + 0.6y = 90 Solving 7.5 + 0.6y = 90 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-7.5' to each side of the equation. 7.5 + -7.5 + 0.6y = 90 + -7.5 Combine like terms: 7.5 + -7.5 = 0.0 0.0 + 0.6y = 90 + -7.5 0.6y = 90 + -7.5 Combine like terms: 90 + -7.5 = 82.5 0.6y = 82.5 Divide each side by '0.6'. y = 137.5 Simplifying y = 137.5
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