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pedro = 100-x 3( 100-x)
3(100- x) = 2x +25
300 -3x = 2x +25
300 -25 = 2x +3x
275 = 5x
275/5 = x
55 = x
juan tiene 55 dolares
pedro tiene 100 -55 = 45 dolares
comprobacion
3 (100- 55) = 2*55 +25
3 *45 = 110+25
135 = 135