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Simplifying 21x + -3 = 15x + 18 Reorder the terms: -3 + 21x = 15x + 18 Reorder the terms: -3 + 21x = 18 + 15x Solving -3 + 21x = 18 + 15x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-15x' to each side of the equation. -3 + 21x + -15x = 18 + 15x + -15x Combine like terms: 21x + -15x = 6x -3 + 6x = 18 + 15x + -15x Combine like terms: 15x + -15x = 0 -3 + 6x = 18 + 0 -3 + 6x = 18 Add '3' to each side of the equation. -3 + 3 + 6x = 18 + 3 Combine like terms: -3 + 3 = 0 0 + 6x = 18 + 3 6x = 18 + 3 Combine like terms: 18 + 3 = 21 6x = 21 Divide each side by '6'. x = 3.5 Simplifying x = 3.5
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