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5/6-((1/5)*x)+4 = (7/10)*x // - (7/10)*x
5/6-((1/5)*x)-((7/10)*x)+4 = 0
(-1/5)*x+(-7/10)*x+5/6+4 = 0
29/6-9/10*x = 0 // - 29/6
-9/10*x = -29/6 // : -9/10
x = -29/6/(-9/10)
x = 145/27
x = 145/27
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