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Simplifying 7(6 + -2a) = 13 + 2r (6 * 7 + -2a * 7) = 13 + 2r (42 + -14a) = 13 + 2r Solving 42 + -14a = 13 + 2r Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-42' to each side of the equation. 42 + -42 + -14a = 13 + -42 + 2r Combine like terms: 42 + -42 = 0 0 + -14a = 13 + -42 + 2r -14a = 13 + -42 + 2r Combine like terms: 13 + -42 = -29 -14a = -29 + 2r Divide each side by '-14'. a = 2.071428571 + -0.1428571429r Simplifying a = 2.071428571 + -0.1428571429r
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