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(-6/7)*x-(9/10) = (3/5)*x-234/175 // - (3/5)*x-234/175
(-6/7)*x-((3/5)*x)-(9/10)-(-234/175) = 0
(-6/7)*x+(-3/5)*x-9/10+234/175 = 0
153/350-51/35*x = 0 // - 153/350
-51/35*x = -153/350 // : -51/35
x = -153/350/(-51/35)
x = 3/10
x = 3/10
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