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3*2+2*3+5= 17
x+x+x*2+2 dla x=2
2+2+2*2+2=10
x-3x+2-2x-7=6
-4x=6-2+7
-4x=11
x= -
17x-2y+46-7x+5y-2x= 10x+3y+46