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a in (-oo:+oo)
4-((5/3)*(3*a+4)) = 7 // - 7
4-((5/3)*(3*a+4))-7 = 0
(-5/3)*(3*a+4)-7+4 = 0
4-5/3*(3*a+4)-7 = 0
4-5/3*(3*a+4)-7 = 0
4-5*a-41/3 = 0
-5*a-29/3 = 0
-5*a-29/3 = 0
-5*a-29/3 = 0 // + 29/3
-5*a = 29/3 // : -5
a = 29/3/(-5)
a = -29/15
a = -29/15
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