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Simplifying -3a + -4(a + -3) = -7 Reorder the terms: -3a + -4(-3 + a) = -7 -3a + (-3 * -4 + a * -4) = -7 -3a + (12 + -4a) = -7 Reorder the terms: 12 + -3a + -4a = -7 Combine like terms: -3a + -4a = -7a 12 + -7a = -7 Solving 12 + -7a = -7 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-12' to each side of the equation. 12 + -12 + -7a = -7 + -12 Combine like terms: 12 + -12 = 0 0 + -7a = -7 + -12 -7a = -7 + -12 Combine like terms: -7 + -12 = -19 -7a = -19 Divide each side by '-7'. a = 2.714285714 Simplifying a = 2.714285714
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