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Simplifying 4 + -1(-7a) = 13 + -6a Remove parenthesis around (-7a) 4 + -1 * -7a = 13 + -6a Multiply -1 * -7 4 + 7a = 13 + -6a Solving 4 + 7a = 13 + -6a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '6a' to each side of the equation. 4 + 7a + 6a = 13 + -6a + 6a Combine like terms: 7a + 6a = 13a 4 + 13a = 13 + -6a + 6a Combine like terms: -6a + 6a = 0 4 + 13a = 13 + 0 4 + 13a = 13 Add '-4' to each side of the equation. 4 + -4 + 13a = 13 + -4 Combine like terms: 4 + -4 = 0 0 + 13a = 13 + -4 13a = 13 + -4 Combine like terms: 13 + -4 = 9 13a = 9 Divide each side by '13'. a = 0.6923076923 Simplifying a = 0.6923076923
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