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4*x+2/5 = (-1/2)*x+319/10 // - (-1/2)*x+319/10
4*x-((-1/2)*x)+2/5-(319/10) = 0
4*x+(1/2)*x+2/5-319/10 = 0
9/2*x-63/2 = 0 // + 63/2
9/2*x = 63/2 // : 9/2
x = 63/2/9/2
x = 7
x = 7
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