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Simplifying -4a + -1(-2a + 3b) + -1(a + -3b) + 3a = 0 -4a + (-2a * -1 + 3b * -1) + -1(a + -3b) + 3a = 0 -4a + (2a + -3b) + -1(a + -3b) + 3a = 0 -4a + 2a + -3b + (a * -1 + -3b * -1) + 3a = 0 -4a + 2a + -3b + (-1a + 3b) + 3a = 0 Reorder the terms: -4a + 2a + -1a + 3a + -3b + 3b = 0 Combine like terms: -4a + 2a = -2a -2a + -1a + 3a + -3b + 3b = 0 Combine like terms: -2a + -1a = -3a -3a + 3a + -3b + 3b = 0 Combine like terms: -3a + 3a = 0 0 + -3b + 3b = 0 -3b + 3b = 0 Combine like terms: -3b + 3b = 0 0 = 0 Solving 0 = 0 Couldn't find a variable to solve for. This equation is an identity, all real numbers are solutions.
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