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3x+y=7
x=9+3y
3(9+3y)+y=7
27+9y+y=7
10y=-20
y=-2
x=9+(3*(-2))=9+(-6) = 9-6 = 3
Pole podstawy = 12*12=144
Pole boczne = 4 * = 100 = 173
173/144~1,2