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Simplifying 75 = 9 + -7a Solving 75 = 9 + -7a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '7a' to each side of the equation. 75 + 7a = 9 + -7a + 7a Combine like terms: -7a + 7a = 0 75 + 7a = 9 + 0 75 + 7a = 9 Add '-75' to each side of the equation. 75 + -75 + 7a = 9 + -75 Combine like terms: 75 + -75 = 0 0 + 7a = 9 + -75 7a = 9 + -75 Combine like terms: 9 + -75 = -66 7a = -66 Divide each side by '7'. a = -9.428571429 Simplifying a = -9.428571429
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