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Simplifying 9(-7 + -6a) + 7(1 + 3a) = 0 (-7 * 9 + -6a * 9) + 7(1 + 3a) = 0 (-63 + -54a) + 7(1 + 3a) = 0 -63 + -54a + (1 * 7 + 3a * 7) = 0 -63 + -54a + (7 + 21a) = 0 Reorder the terms: -63 + 7 + -54a + 21a = 0 Combine like terms: -63 + 7 = -56 -56 + -54a + 21a = 0 Combine like terms: -54a + 21a = -33a -56 + -33a = 0 Solving -56 + -33a = 0 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '56' to each side of the equation. -56 + 56 + -33a = 0 + 56 Combine like terms: -56 + 56 = 0 0 + -33a = 0 + 56 -33a = 0 + 56 Combine like terms: 0 + 56 = 56 -33a = 56 Divide each side by '-33'. a = -1.696969697 Simplifying a = -1.696969697
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