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4x+5x-12y-y+6=0
9x-13y+6=0
2.5x-5(y+1)=2(3y-1)+3x+20
5x-5y-5=6y-2+3x+20
5x-3x-5y-6y-5-18=0 pindah ruas
2x-11y-23=0