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Simplifying 4a + -7(a + -3) = 3 Reorder the terms: 4a + -7(-3 + a) = 3 4a + (-3 * -7 + a * -7) = 3 4a + (21 + -7a) = 3 Reorder the terms: 21 + 4a + -7a = 3 Combine like terms: 4a + -7a = -3a 21 + -3a = 3 Solving 21 + -3a = 3 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 + -3a = 3 + -21 Combine like terms: 21 + -21 = 0 0 + -3a = 3 + -21 -3a = 3 + -21 Combine like terms: 3 + -21 = -18 -3a = -18 Divide each side by '-3'. a = 6 Simplifying a = 6
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