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Simplifying 6a + -9x = 21a + -15x Solving 6a + -9x = 21a + -15x Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-21a' to each side of the equation. 6a + -21a + -9x = 21a + -21a + -15x Combine like terms: 6a + -21a = -15a -15a + -9x = 21a + -21a + -15x Combine like terms: 21a + -21a = 0 -15a + -9x = 0 + -15x -15a + -9x = -15x Add '9x' to each side of the equation. -15a + -9x + 9x = -15x + 9x Combine like terms: -9x + 9x = 0 -15a + 0 = -15x + 9x -15a = -15x + 9x Combine like terms: -15x + 9x = -6x -15a = -6x Divide each side by '-15'. a = 0.4x Simplifying a = 0.4x
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