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Simplifying a + (a + -3) = (a + -7) + -1(a + 4) Reorder the terms: a + (-3 + a) = (a + -7) + -1(a + 4) Remove parenthesis around (-3 + a) a + -3 + a = (a + -7) + -1(a + 4) Reorder the terms: -3 + a + a = (a + -7) + -1(a + 4) Combine like terms: a + a = 2a -3 + 2a = (a + -7) + -1(a + 4) Reorder the terms: -3 + 2a = (-7 + a) + -1(a + 4) Remove parenthesis around (-7 + a) -3 + 2a = -7 + a + -1(a + 4) Reorder the terms: -3 + 2a = -7 + a + -1(4 + a) -3 + 2a = -7 + a + (4 * -1 + a * -1) -3 + 2a = -7 + a + (-4 + -1a) Reorder the terms: -3 + 2a = -7 + -4 + a + -1a Combine like terms: -7 + -4 = -11 -3 + 2a = -11 + a + -1a Combine like terms: a + -1a = 0 -3 + 2a = -11 + 0 -3 + 2a = -11 Solving -3 + 2a = -11 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + 2a = -11 + 3 Combine like terms: -3 + 3 = 0 0 + 2a = -11 + 3 2a = -11 + 3 Combine like terms: -11 + 3 = -8 2a = -8 Divide each side by '2'. a = -4 Simplifying a = -4
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