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a in (-oo:+oo)
4-((3/7)*(3*a+4)) = 7 // - 7
4-((3/7)*(3*a+4))-7 = 0
(-3/7)*(3*a+4)-7+4 = 0
4-3/7*(3*a+4)-7 = 0
4-3/7*(3*a+4)-7 = 0
4-9/7*a-61/7 = 0
-9/7*a-33/7 = 0
-9/7*a-33/7 = 0
-9/7*a-33/7 = 0 // + 33/7
-9/7*a = 33/7 // : -9/7
a = 33/7/(-9/7)
a = -11/3
a = -11/3
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