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(2/5)*x-(3/10) = (7/15)*x-1 // - (7/15)*x-1
(2/5)*x-((7/15)*x)-(3/10)+1 = 0
(2/5)*x+(-7/15)*x-3/10+1 = 0
7/10-1/15*x = 0 // - 7/10
-1/15*x = -7/10 // : -1/15
x = -7/10/(-1/15)
x = 21/2
x = 21/2
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