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(1/5)*(3*x+9) = 2*(4-(3*x))+7 // - 2*(4-(3*x))+7
(1/5)*(3*x+9)-(2*(4-(3*x)))-7 = 0
(1/5)*(3*x+9)-2*(4-3*x)-7 = 0
1/5*(3*x+9)-2*(4-3*x)-7 = 0
1/5*(3*x+9)-2*(4-3*x)-7 = 0
33/5*x-7-31/5 = 0
33/5*x-66/5 = 0
33/5*x-66/5 = 0
33/5*x-66/5 = 0 // + 66/5
33/5*x = 66/5 // : 33/5
x = 66/5/33/5
x = 2
x = 2
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