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4-((3/5)*(3*x+4)) = 7 // - 7
4-((3/5)*(3*x+4))-7 = 0
(-3/5)*(3*x+4)-7+4 = 0
4-3/5*(3*x+4)-7 = 0
4-3/5*(3*x+4)-7 = 0
4-9/5*x-47/5 = 0
-9/5*x-27/5 = 0
-9/5*x-27/5 = 0
-9/5*x-27/5 = 0 // + 27/5
-9/5*x = 27/5 // : -9/5
x = 27/5/(-9/5)
x = -3
x = -3
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