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a in (-oo:+oo)
3*a+2 = (3/7)*a-40/7 // - (3/7)*a-40/7
3*a-((3/7)*a)-(-40/7)+2 = 0
3*a+(-3/7)*a+40/7+2 = 0
18/7*a+54/7 = 0 // - 54/7
18/7*a = -54/7 // : 18/7
a = -54/7/18/7
a = -3
a = -3
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