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------- -3 * ---------
2 5
4(x-1)/2-3(10x)-50/5=
(4x-4)/2-(30x-50)/5=(*10)
10(4x-4)/2-10(30x-50)/5=
5(4x-4)-2(30x-50)=
20x-20-60x+100=
-40x=-80
x=2