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4-((3/10)*x) = (1/5)*x // - (1/5)*x
4-((3/10)*x)-((1/5)*x) = 0
(-3/10)*x+(-1/5)*x+4 = 0
4-1/2*x = 0 // - 4
-1/2*x = -4 // : -1/2
x = -4/(-1/2)
x = 8
x = 8
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