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Simplifying 8a + -3(7 + 10a) = 0 8a + (7 * -3 + 10a * -3) = 0 8a + (-21 + -30a) = 0 Reorder the terms: -21 + 8a + -30a = 0 Combine like terms: 8a + -30a = -22a -21 + -22a = 0 Solving -21 + -22a = 0 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '21' to each side of the equation. -21 + 21 + -22a = 0 + 21 Combine like terms: -21 + 21 = 0 0 + -22a = 0 + 21 -22a = 0 + 21 Combine like terms: 0 + 21 = 21 -22a = 21 Divide each side by '-22'. a = -0.9545454545 Simplifying a = -0.9545454545
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