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4x+7y=15
x=⅔-2y
4(⅔-2y)+7y=15
2⅔-8y+7y=15
-y=12⅓
y=-12⅓
x=⅔-2*(-12⅓)
x=⅔+24⅔
x=25⅓
spr:
3x+6y=2
3*25⅓+6*(-12⅓)=2
76-74=2
2=2