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Simplifying -3a + 5a = -1(4a + 4) + -1(-1 + 1) Combine like terms: -3a + 5a = 2a 2a = -1(4a + 4) + -1(-1 + 1) Reorder the terms: 2a = -1(4 + 4a) + -1(-1 + 1) 2a = (4 * -1 + 4a * -1) + -1(-1 + 1) 2a = (-4 + -4a) + -1(-1 + 1) Combine like terms: -1 + 1 = 0 2a = -4 + -4a + -1(0) Multiply -1 * 0 2a = -4 + -4a + 0 Anything times zero is zero. 2a = -4 + -4a + 0 Reorder the terms: 2a = -4 + 0 + -4a Combine like terms: -4 + 0 = -4 2a = -4 + -4a Solving 2a = -4 + -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. 2a + 4a = -4 + -4a + 4a Combine like terms: 2a + 4a = 6a 6a = -4 + -4a + 4a Combine like terms: -4a + 4a = 0 6a = -4 + 0 6a = -4 Divide each side by '6'. a = -0.6666666667 Simplifying a = -0.6666666667
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