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(1/3)*(4*x+1) = 3*(3-(4*x))+18 // - 3*(3-(4*x))+18
(1/3)*(4*x+1)-(3*(3-(4*x)))-18 = 0
(1/3)*(4*x+1)-3*(3-4*x)-18 = 0
1/3*(4*x+1)-3*(3-4*x)-18 = 0
1/3*(4*x+1)-3*(3-4*x)-18 = 0
40/3*x-18-26/3 = 0
40/3*x-80/3 = 0
40/3*x-80/3 = 0
40/3*x-80/3 = 0 // + 80/3
40/3*x = 80/3 // : 40/3
x = 80/3/40/3
x = 2
x = 2
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