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a in (-oo:+oo)
(-3/5)*(3*a+4) = 7 // - 7
(-3/5)*(3*a+4)-7 = 0
-3/5*(3*a+4)-7 = 0
-3/5*(3*a+4)-7 = 0
-9/5*a-47/5 = 0
-9/5*a-47/5 = 0
-9/5*a-47/5 = 0 // + 47/5
-9/5*a = 47/5 // : -9/5
a = 47/5/(-9/5)
a = -47/9
a = -47/9
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