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a in (-oo:+oo)
(-6/7)*a+2*a+10 = 342/35 // - 342/35
(-6/7)*a+2*a-(342/35)+10 = 0
(-6/7)*a+2*a-342/35+10 = 0
8/7*a+8/35 = 0 // - 8/35
8/7*a = -8/35 // : 8/7
a = -8/35/8/7
a = -1/5
a = -1/5
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