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0.5*x-3 = (1/7)*x-(1/7) // - (1/7)*x-(1/7)
0.5*x-((1/7)*x)+1/7-3 = 0
0.5*x+(-1/7)*x+1/7-3 = 0
0.35714286*x-20/7 = 0 // + 20/7
0.35714286*x = 20/7 // : 0.35714286
x = 20/7/0.35714286
x = 7.99999994
x = 7.99999994
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