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{1/4b = a - 35
*2a - b = 50
-b = 50 - 2a
(*-1)
b = -50 + 2a
b = 2a - 50
*1/4b = a - 35
1/4 (2a - 50) = a - 35
1/2a - 25/2 = a - 35
1/2a - a = -35 + 25/2
-1/2a = -45/2
-a = 2 (-45/2)
-a = -45
(*-1)
a = 45
*2a - b = 50
2 (45) - b = 50
90 - b = 50
-b = 50 - 90
-b = -40
(*-1)
b = 40
saludos :)