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x/10-(y/3)-7 = 0
1/10*x-1/3*y-7 = 0 // + -1/3*y-7
1/10*x = -(-1/3*y-7) // : 1/10
x = (-(-1/3*y-7))/1/10
x = 10*(7-(-1/3*y))
x = 10*(7-(-1/3*y))
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