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Simplifying 2a + [a + -1(b + -1c)] + -1[2a + -1(b + -1c)] = 0 2a + [a + (b * -1 + -1c * -1)] + -1[2a + -1(b + -1c)] = 0 2a + [a + (-1b + 1c)] + -1[2a + -1(b + -1c)] = 0 Remove brackets around [a + -1b + 1c] 2a + a + -1b + 1c + -1[2a + -1(b + -1c)] = 0 2a + a + -1b + 1c + -1[2a + (b * -1 + -1c * -1)] = 0 2a + a + -1b + 1c + -1[2a + (-1b + 1c)] = 0 2a + a + -1b + 1c + [2a * -1 + -1b * -1 + 1c * -1] = 0 2a + a + -1b + 1c + [-2a + 1b + -1c] = 0 Reorder the terms: 2a + a + -2a + -1b + 1b + 1c + -1c = 0 Combine like terms: 2a + a = 3a 3a + -2a + -1b + 1b + 1c + -1c = 0 Combine like terms: 3a + -2a = 1a 1a + -1b + 1b + 1c + -1c = 0 Combine like terms: -1b + 1b = 0 1a + 0 + 1c + -1c = 0 1a + 1c + -1c = 0 Combine like terms: 1c + -1c = 0 1a + 0 = 0 1a = 0 Solving 1a = 0 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Divide each side by '1'. a = 0 Simplifying a = 0
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