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(4/5)*(x+5)+(3/5)*x = 7 // - 7
(4/5)*(x+5)+(3/5)*x-7 = 0
4/5*(x+5)+(3*x)/5-7 = 0
(4/5*5*(x+5))/5+(3*x)/5+(-7*5)/5 = 0
4/5*5*(x+5)+3*x-7*5 = 0
7*x-35+20 = 0
7*x-15 = 0
(7*x-15)/5 = 0
(7*x-15)/5 = 0 // * 5
7*x-15 = 0
7*x-15 = 0 // + 15
7*x = 15 // : 7
x = 15/7
x = 15/7
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