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(5/10)*x-((1/5)*x)+4 = (7/10)*x // - (7/10)*x
(5/10)*x-((1/5)*x)-((7/10)*x)+4 = 0
(5/10)*x+(-1/5)*x+(-7/10)*x+4 = 0
4-2/5*x = 0 // - 4
-2/5*x = -4 // : -2/5
x = -4/(-2/5)
x = 10
x = 10
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