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(3/70)*x-((3*x)/7)-x+4+8 = 0
(-3/7)*x-x+(3/70)*x+4+8 = 0
12-97/70*x = 0 // - 12
-97/70*x = -12 // : -97/70
x = -12/(-97/70)
x = 840/97
x = 840/97
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