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16x - 8 + (x + 13) = 72x + 15x + 15
x + 13 = 87 + 15 - 16x + 8
x + 13 = 71x + 23
13 - 23 = 71x - x
-10 = 70x
-10 : 70 = x
-10/70 = x
-1/7 = x
No se si esta bien
16x-8+x+13 = 72x+15x+15
16x+x-72-15x = 15-13+8
-70x = 10
x = 10/-70