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8x+12-8y+2=30
8x-8y=30-14
8x-8y=16/8
x-y=2
{(5x+1):3 - (y-3):4=3 /12
4(5x+1)-3(y-3)=36
20x+4-3y+9=36
20x-3y=36-13
20x-3y=23