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x=y-15
2(y-15)+y=180
2y-30+y=210
3y=210/y
y=70st
x=y-15
x=70-15
x=55
y=70
joł
x=y-15
x=y-15
2(y-15)+y=180
x=y-15
2y-30+y=180
x=y-15
3y=180+30
x=y-15
3y=210 /÷3
x=y-15
y=70
x=70-15
y=70
x=55
y=70
Sprawdzenie:
2×55+70=180
180=180