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Simplifying -20 + -4a = -3(1 + 7a) -20 + -4a = (1 * -3 + 7a * -3) -20 + -4a = (-3 + -21a) Solving -20 + -4a = -3 + -21a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '21a' to each side of the equation. -20 + -4a + 21a = -3 + -21a + 21a Combine like terms: -4a + 21a = 17a -20 + 17a = -3 + -21a + 21a Combine like terms: -21a + 21a = 0 -20 + 17a = -3 + 0 -20 + 17a = -3 Add '20' to each side of the equation. -20 + 20 + 17a = -3 + 20 Combine like terms: -20 + 20 = 0 0 + 17a = -3 + 20 17a = -3 + 20 Combine like terms: -3 + 20 = 17 17a = 17 Divide each side by '17'. a = 1 Simplifying a = 1
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