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6+9 = (8/7)*(x-6) // - (8/7)*(x-6)
6-((8/7)*(x-6))+9 = 0
(-8/7)*(x-6)+6+9 = 0
6-8/7*(x-6)+9 = 0
6-8/7*(x-6)+9 = 0
9-8/7*x+90/7 = 0
153/7-8/7*x = 0
153/7-8/7*x = 0
153/7-8/7*x = 0 // - 153/7
-8/7*x = -153/7 // : -8/7
x = -153/7/(-8/7)
x = 153/8
x = 153/8
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