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Simplifying 7(4a) + 7(3b) = 0 Remove parenthesis around (4a) 7 * 4a + 7(3b) = 0 Multiply 7 * 4 28a + 7(3b) = 0 Remove parenthesis around (3b) 28a + 7 * 3b = 0 Multiply 7 * 3 28a + 21b = 0 Solving 28a + 21b = 0 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-21b' to each side of the equation. 28a + 21b + -21b = 0 + -21b Combine like terms: 21b + -21b = 0 28a + 0 = 0 + -21b 28a = 0 + -21b Remove the zero: 28a = -21b Divide each side by '28'. a = -0.75b Simplifying a = -0.75b
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