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6*x-7 = (1/40)*x // - (1/40)*x
6*x-((1/40)*x)-7 = 0
6*x+(-1/40)*x-7 = 0
239/40*x-7 = 0 // + 7
239/40*x = 7 // : 239/40
x = 7/239/40
x = 280/239
x = 280/239
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