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Simplifying [a + 7(c + -3)] = 0 Reorder the terms: [a + 7(-3 + c)] = 0 [a + (-3 * 7 + c * 7)] = 0 [a + (-21 + 7c)] = 0 Reorder the terms: [-21 + a + 7c] = 0 Remove brackets around [-21 + a + 7c] -21 + a + 7c = 0 Solving -21 + a + 7c = 0 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '21' to each side of the equation. -21 + a + 21 + 7c = 0 + 21 Reorder the terms: -21 + 21 + a + 7c = 0 + 21 Combine like terms: -21 + 21 = 0 0 + a + 7c = 0 + 21 a + 7c = 0 + 21 Combine like terms: 0 + 21 = 21 a + 7c = 21 Add '-7c' to each side of the equation. a + 7c + -7c = 21 + -7c Combine like terms: 7c + -7c = 0 a + 0 = 21 + -7c a = 21 + -7c Simplifying a = 21 + -7c
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