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3*x-((3/7)*x)-(1/4) = 19/14 // - 19/14
3*x-((3/7)*x)-(1/4)-(19/14) = 0
3*x+(-3/7)*x-1/4-19/14 = 0
18/7*x-45/28 = 0 // + 45/28
18/7*x = 45/28 // : 18/7
x = 45/28/18/7
x = 5/8
x = 5/8
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