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Simplifying 20 = 4(a + -3) Reorder the terms: 20 = 4(-3 + a) 20 = (-3 * 4 + a * 4) 20 = (-12 + 4a) Solving 20 = -12 + 4a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-4a' to each side of the equation. 20 + -4a = -12 + 4a + -4a Combine like terms: 4a + -4a = 0 20 + -4a = -12 + 0 20 + -4a = -12 Add '-20' to each side of the equation. 20 + -20 + -4a = -12 + -20 Combine like terms: 20 + -20 = 0 0 + -4a = -12 + -20 -4a = -12 + -20 Combine like terms: -12 + -20 = -32 -4a = -32 Divide each side by '-4'. a = 8 Simplifying a = 8
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