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2x=>tyle pieniędzy ma Staszek
2x-85=x+85
2x-85=x+85/+85
2x=x+170/-x
x=170
Prrroszę!
y-pieniądze Janka
x=2y
x-85=y-85
x=2y
x-y=85+85
x=2y
-y=170-x|*(-1)
x=2y
y=-170+2y
x=2y
-y=-170|*(-1)
x=2y
y=170
x=340
y=170