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a in (-oo:+oo)
3*a+4/7 = (1/7)*a+144/77 // - (1/7)*a+144/77
3*a-((1/7)*a)+4/7-(144/77) = 0
3*a+(-1/7)*a+4/7-144/77 = 0
20/7*a-100/77 = 0 // + 100/77
20/7*a = 100/77 // : 20/7
a = 100/77/20/7
a = 5/11
a = 5/11
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