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Simplifying 18x + 21 = 10x + 45 Reorder the terms: 21 + 18x = 10x + 45 Reorder the terms: 21 + 18x = 45 + 10x Solving 21 + 18x = 45 + 10x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-10x' to each side of the equation. 21 + 18x + -10x = 45 + 10x + -10x Combine like terms: 18x + -10x = 8x 21 + 8x = 45 + 10x + -10x Combine like terms: 10x + -10x = 0 21 + 8x = 45 + 0 21 + 8x = 45 Add '-21' to each side of the equation. 21 + -21 + 8x = 45 + -21 Combine like terms: 21 + -21 = 0 0 + 8x = 45 + -21 8x = 45 + -21 Combine like terms: 45 + -21 = 24 8x = 24 Divide each side by '8'. x = 3 Simplifying x = 3
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