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3y=1/2x-20
rozw.:
3y= 1/2(y+7)-20
3y= 1/2 y+ 3,5 - 20
2,5y = -16,5
y = -6,6
x = 0,4
3y=½x-20
3y=½(y+7)-20
3y=½ y+ 3,5-20
3y-½=3,5-20
2,5y=-16,5 /:2,5
y=-6,6
x=-6,6+7
x=0,4