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40-(4*(1/28)*x) = 30-(3*(1/28)*x) // - 30-(3*(1/28)*x)
3*(1/28)*x-(4*(1/28)*x)-30+40 = 0
(-1/7)*x+3*(1/28)*x-30+40 = 0
10-1/28*x = 0 // - 10
-1/28*x = -10 // : -1/28
x = -10/(-1/28)
x = 280
x = 280
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