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Simplifying 0b + 3b + 7a + 21 = 0 Anything times zero is zero. 0b + 3b + 7a + 21 = 0 Reorder the terms: 0 + 21 + 7a + 3b = 0 Combine like terms: 0 + 21 = 21 21 + 7a + 3b = 0 Solving 21 + 7a + 3b = 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 + 7a + -21 + 3b = 0 + -21 Reorder the terms: 21 + -21 + 7a + 3b = 0 + -21 Combine like terms: 21 + -21 = 0 0 + 7a + 3b = 0 + -21 7a + 3b = 0 + -21 Combine like terms: 0 + -21 = -21 7a + 3b = -21 Add '-3b' to each side of the equation. 7a + 3b + -3b = -21 + -3b Combine like terms: 3b + -3b = 0 7a + 0 = -21 + -3b 7a = -21 + -3b Divide each side by '7'. a = -3 + -0.4285714286b Simplifying a = -3 + -0.4285714286b
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