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Simplifying 125 + -5x = 13x + 21 Reorder the terms: 125 + -5x = 21 + 13x Solving 125 + -5x = 21 + 13x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-13x' to each side of the equation. 125 + -5x + -13x = 21 + 13x + -13x Combine like terms: -5x + -13x = -18x 125 + -18x = 21 + 13x + -13x Combine like terms: 13x + -13x = 0 125 + -18x = 21 + 0 125 + -18x = 21 Add '-125' to each side of the equation. 125 + -125 + -18x = 21 + -125 Combine like terms: 125 + -125 = 0 0 + -18x = 21 + -125 -18x = 21 + -125 Combine like terms: 21 + -125 = -104 -18x = -104 Divide each side by '-18'. x = 5.777777778 Simplifying x = 5.777777778
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