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Simplifying -7a + 2(a + -3) = -20 + -3a Reorder the terms: -7a + 2(-3 + a) = -20 + -3a -7a + (-3 * 2 + a * 2) = -20 + -3a -7a + (-6 + 2a) = -20 + -3a Reorder the terms: -6 + -7a + 2a = -20 + -3a Combine like terms: -7a + 2a = -5a -6 + -5a = -20 + -3a Solving -6 + -5a = -20 + -3a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '3a' to each side of the equation. -6 + -5a + 3a = -20 + -3a + 3a Combine like terms: -5a + 3a = -2a -6 + -2a = -20 + -3a + 3a Combine like terms: -3a + 3a = 0 -6 + -2a = -20 + 0 -6 + -2a = -20 Add '6' to each side of the equation. -6 + 6 + -2a = -20 + 6 Combine like terms: -6 + 6 = 0 0 + -2a = -20 + 6 -2a = -20 + 6 Combine like terms: -20 + 6 = -14 -2a = -14 Divide each side by '-2'. a = 7 Simplifying a = 7
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