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4/5-x = (1/3)*x+7/15 // - (1/3)*x+7/15
4/5-x-((1/3)*x)-(7/15) = 0
(-1/3)*x-x+4/5-7/15 = 0
1/3-4/3*x = 0 // - 1/3
-4/3*x = -1/3 // : -4/3
x = -1/3/(-4/3)
x = 1/4
x = 1/4
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