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ax-x+by+15-(ax-x+15)=-(ax-x+15)
by/b=(x-ax-15)/b
y=(x-ax-15)/b
ax+2y-by-23-(ax-23)=-(ax-23)
2y-by=-ax+23
y(b-2)=ax+23
y(b-2)/-b+2=(ax+23)/-b+2