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Simplifying 20 + -21 = 21 + -21 + 13a Combine like terms: 20 + -21 = -1 -1 = 21 + -21 + 13a Combine like terms: 21 + -21 = 0 -1 = 0 + 13a -1 = 13a Solving -1 = 13a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-13a' to each side of the equation. -1 + -13a = 13a + -13a Combine like terms: 13a + -13a = 0 -1 + -13a = 0 Add '1' to each side of the equation. -1 + 1 + -13a = 0 + 1 Combine like terms: -1 + 1 = 0 0 + -13a = 0 + 1 -13a = 0 + 1 Combine like terms: 0 + 1 = 1 -13a = 1 Divide each side by '-13'. a = -0.07692307692 Simplifying a = -0.07692307692
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