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3/7-4*x = (1/2)*x-249/7 // - (1/2)*x-249/7
3/7-4*x-((1/2)*x)-(-249/7) = 0
(-1/2)*x-4*x+3/7+249/7 = 0
36-9/2*x = 0 // - 36
-9/2*x = -36 // : -9/2
x = -36/(-9/2)
x = 8
x = 8
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