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7x=5y
y=2x+4
y=7/5x
y=2x+4
y=1 2/5x
7x=5y
{y=2x+4
7x=5(2x+4)
7x=10x+20
7x-10x=20
-3x20
x=-20/3
y=2(-20/3)+4
y=-40/3+4
y=-13 1/3 +4
y=-9 1/3 =-28/3
x=-20/3
y=-28/3
Spr.
7x=5y
7*(-20/3)=5*(-28/3)
-140/3=-140/3
pozdrawiam:)