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Lo que debes hacer es despejar (encontrar) el valor de n y de m en las ecuaciones.
2n - 100 = 90
2n -100 + 100 = 90 + 100
2n = 190
n = 190/2
n = 95
2m + 6 = 180
2m + 6 - 6 = 180 - 6
2m = 174
m = 174/2
m = 87