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28-(4*(1/22)*x) = 21-(3*(1/22)*x) // - 21-(3*(1/22)*x)
3*(1/22)*x-(4*(1/22)*x)-21+28 = 0
(-2/11)*x+3*(1/22)*x-21+28 = 0
7-1/22*x = 0 // - 7
-1/22*x = -7 // : -1/22
x = -7/(-1/22)
x = 154
x = 154
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