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(x-3)/4=(4(y+x)+11)/20-1.5 /*20
5-1,5y+3=x+1
5x-15=4y+4x+11-30
-x-1,5y=-7
x-4y=-4
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0-5,5y=-11 /:(-5,5)
y=2
x-8=-4
x=4