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Simplifying 21x + -18 = 6x + 20 Reorder the terms: -18 + 21x = 6x + 20 Reorder the terms: -18 + 21x = 20 + 6x Solving -18 + 21x = 20 + 6x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-6x' to each side of the equation. -18 + 21x + -6x = 20 + 6x + -6x Combine like terms: 21x + -6x = 15x -18 + 15x = 20 + 6x + -6x Combine like terms: 6x + -6x = 0 -18 + 15x = 20 + 0 -18 + 15x = 20 Add '18' to each side of the equation. -18 + 18 + 15x = 20 + 18 Combine like terms: -18 + 18 = 0 0 + 15x = 20 + 18 15x = 20 + 18 Combine like terms: 20 + 18 = 38 15x = 38 Divide each side by '15'. x = 2.533333333 Simplifying x = 2.533333333
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