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6x+4y-11=9 /-4y
6x-11=9 /+11
6x=20
x=3,33
10x-2+3y=15x+5y+2 /-10x
x-2+3y=5x+5y+2/-5y
x-2+(-2y)=5x+2 /-2
x-4+(-2y)=5x/-x
-4+(-2y)=4x/+2y
-4=4x /:4
x=1