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Simplifying 640 + 30x = 450 + 25x Solving 640 + 30x = 450 + 25x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-25x' to each side of the equation. 640 + 30x + -25x = 450 + 25x + -25x Combine like terms: 30x + -25x = 5x 640 + 5x = 450 + 25x + -25x Combine like terms: 25x + -25x = 0 640 + 5x = 450 + 0 640 + 5x = 450 Add '-640' to each side of the equation. 640 + -640 + 5x = 450 + -640 Combine like terms: 640 + -640 = 0 0 + 5x = 450 + -640 5x = 450 + -640 Combine like terms: 450 + -640 = -190 5x = -190 Divide each side by '5'. x = -38 Simplifying x = -38
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