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72+118=20x+10
190-10=20x
180=20x
9=x
B) 36 + 59 = (20x + 10)/2
95 = (20x + 10)/2
95*2 = 20x + 10
190 = 20x + 10
-20x = 10 - 190
-20x = -180
x = -180/-20
x = 9 → respuesta