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Simplifying 3(x + -2b) + -9a + -15b = 0 Reorder the terms: 3(-2b + x) + -9a + -15b = 0 (-2b * 3 + x * 3) + -9a + -15b = 0 (-6b + 3x) + -9a + -15b = 0 Reorder the terms: -9a + -6b + -15b + 3x = 0 Combine like terms: -6b + -15b = -21b -9a + -21b + 3x = 0 Solving -9a + -21b + 3x = 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. -9a + -21b + 21b + 3x = 0 + 21b Combine like terms: -21b + 21b = 0 -9a + 0 + 3x = 0 + 21b -9a + 3x = 0 + 21b Remove the zero: -9a + 3x = 21b Add '-3x' to each side of the equation. -9a + 3x + -3x = 21b + -3x Combine like terms: 3x + -3x = 0 -9a + 0 = 21b + -3x -9a = 21b + -3x Divide each side by '-9'. a = -2.333333333b + 0.3333333333x Simplifying a = -2.333333333b + 0.3333333333x
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