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Simplifying 99 = -3(7 + -5a) 99 = (7 * -3 + -5a * -3) 99 = (-21 + 15a) Solving 99 = -21 + 15a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-15a' to each side of the equation. 99 + -15a = -21 + 15a + -15a Combine like terms: 15a + -15a = 0 99 + -15a = -21 + 0 99 + -15a = -21 Add '-99' to each side of the equation. 99 + -99 + -15a = -21 + -99 Combine like terms: 99 + -99 = 0 0 + -15a = -21 + -99 -15a = -21 + -99 Combine like terms: -21 + -99 = -120 -15a = -120 Divide each side by '-15'. a = 8 Simplifying a = 8
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