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3*x+3/4 = (1/7)*x+981/28 // - (1/7)*x+981/28
3*x-((1/7)*x)+3/4-(981/28) = 0
3*x+(-1/7)*x+3/4-981/28 = 0
20/7*x-240/7 = 0 // + 240/7
20/7*x = 240/7 // : 20/7
x = 240/7/20/7
x = 12
x = 12
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