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3/8-(4*x) = (2/7)*x+261/56 // - (2/7)*x+261/56
3/8-(4*x)-((2/7)*x)-(261/56) = 0
(-2/7)*x-4*x+3/8-261/56 = 0
-30/7*x-30/7 = 0 // + 30/7
-30/7*x = 30/7 // : -30/7
x = 30/7/(-30/7)
x = -1
x = -1
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