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a in (-oo:+oo)
a-((3*(a-5))/6)-(1/7) = 3*a+15/3 // - 3*a+15/3
a-((3*(a-5))/6)-(3*a)-(1/7)-(15/3) = 0
(-1/2)*(a-5)+a-3*a-1/7-5 = 0
a-1/2*(a-5)-3*a-1/7-5 = 0
(-1/2*7*(a-5))/7+(7*a)/7+(-3*7*a)/7-1/7+(-5*7)/7 = 0
7*a-1/2*7*(a-5)-3*7*a-5*7-1 = 0
7/2*a-21*a-35-1+35/2 = 0
35/2-35/2*a-35-1 = 0
33/2-35/2*a-35 = 0
-35/2*a-37/2 = 0
(-35/2*a-37/2)/7 = 0
(-35/2*a-37/2)/7 = 0 // * 7
-35/2*a-37/2 = 0
-35/2*a-37/2 = 0 // + 37/2
-35/2*a = 37/2 // : -35/2
a = 37/2/(-35/2)
a = -37/35
a = -37/35
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