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5.x + 15 = 25 (x é a incógnita)
13.y + 3x + 4 = 50 (x e y são as incógnitas)
4 + 2.x= 14 (x é a incógnita)
5.y + 4.x - 2= 27 (x e y são as incógnitas)
2x + 1y= 6 (x e y são as incógnitas)
2.c + 7.n + 5= 43 ( c e n são as incógnitas)
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