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(-1/7)*(35*x-(28*y)) = 0
(-1/7)*(35*x-28*y) = 0
-1/7*(35*x-28*y) = 0
35*x-28*y = 0 // + -28*y
35*x = -(-28*y) // : 35
x = (-(-28*y))/35
x = (4*y)/5
x = (4*y)/5
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