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Simplifying 18x3 + 21x2 + -15a = 0 Reorder the terms: -15a + 21x2 + 18x3 = 0 Solving -15a + 21x2 + 18x3 = 0 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-21x2' to each side of the equation. -15a + 21x2 + -21x2 + 18x3 = 0 + -21x2 Combine like terms: 21x2 + -21x2 = 0 -15a + 0 + 18x3 = 0 + -21x2 -15a + 18x3 = 0 + -21x2 Remove the zero: -15a + 18x3 = -21x2 Add '-18x3' to each side of the equation. -15a + 18x3 + -18x3 = -21x2 + -18x3 Combine like terms: 18x3 + -18x3 = 0 -15a + 0 = -21x2 + -18x3 -15a = -21x2 + -18x3 Divide each side by '-15'. a = 1.4x2 + 1.2x3 Simplifying a = 1.4x2 + 1.2x3
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