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Simplifying 45 + -4x = 5x + 21 Reorder the terms: 45 + -4x = 21 + 5x Solving 45 + -4x = 21 + 5x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5x' to each side of the equation. 45 + -4x + -5x = 21 + 5x + -5x Combine like terms: -4x + -5x = -9x 45 + -9x = 21 + 5x + -5x Combine like terms: 5x + -5x = 0 45 + -9x = 21 + 0 45 + -9x = 21 Add '-45' to each side of the equation. 45 + -45 + -9x = 21 + -45 Combine like terms: 45 + -45 = 0 0 + -9x = 21 + -45 -9x = 21 + -45 Combine like terms: 21 + -45 = -24 -9x = -24 Divide each side by '-9'. x = 2.666666667 Simplifying x = 2.666666667
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