10 = (x+2 + 3x-1) /2 /*2
2*10 = 4x+1
20-1=4x
4x=19 /:4
x=4 3/4
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10 = (x+2 + 3x-1) /2 /*2
2*10 = 4x+1
20-1=4x
4x=19 /:4
x=4 3/4