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Simplifying -7(-1 + 3a) = 5(3 + -5) (-1 * -7 + 3a * -7) = 5(3 + -5) (7 + -21a) = 5(3 + -5) Combine like terms: 3 + -5 = -2 7 + -21a = 5(-2) Multiply 5 * -2 7 + -21a = -10 Solving 7 + -21a = -10 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + -21a = -10 + -7 Combine like terms: 7 + -7 = 0 0 + -21a = -10 + -7 -21a = -10 + -7 Combine like terms: -10 + -7 = -17 -21a = -17 Divide each side by '-21'. a = 0.8095238095 Simplifying a = 0.8095238095
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