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Simplifying 18x + -21 = 15x Reorder the terms: -21 + 18x = 15x Solving -21 + 18x = 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. -21 + 18x + -15x = 15x + -15x Combine like terms: 18x + -15x = 3x -21 + 3x = 15x + -15x Combine like terms: 15x + -15x = 0 -21 + 3x = 0 Add '21' to each side of the equation. -21 + 21 + 3x = 0 + 21 Combine like terms: -21 + 21 = 0 0 + 3x = 0 + 21 3x = 0 + 21 Combine like terms: 0 + 21 = 21 3x = 21 Divide each side by '3'. x = 7 Simplifying x = 7
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