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4x+5y=18,90
x+2y=6
4x+5y=18,90
x=6-2y x=6-2y y=1.7
4(6-2y)+5y =18.90 x =6-3,4 x=2,6
24-8y+5y=18.90
-3y=-5,10 /-3
y=1,7