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Simplifying 18x + -21 + -15x = e Reorder the terms: -21 + 18x + -15x = e Combine like terms: 18x + -15x = 3x -21 + 3x = e Solving -21 + 3x = e Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '21' to each side of the equation. -21 + 21 + 3x = 21 + e Combine like terms: -21 + 21 = 0 0 + 3x = 21 + e 3x = 21 + e Divide each side by '3'. x = 7 + 0.3333333333e Simplifying x = 7 + 0.3333333333e
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