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Simplifying 21 + -2.5x = 7.5 Solving 21 + -2.5x = 7.5 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 + -2.5x = 7.5 + -21 Combine like terms: 21 + -21 = 0 0 + -2.5x = 7.5 + -21 -2.5x = 7.5 + -21 Combine like terms: 7.5 + -21 = -13.5 -2.5x = -13.5 Divide each side by '-2.5'. x = 5.4 Simplifying x = 5.4
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