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(1/4)*(x+3)+(3/8)*x = 13/4 // - 13/4
(1/4)*(x+3)+(3/8)*x-(13/4) = 0
(1/4)*(x+3)+(3/8)*x-13/4 = 0
1/4*(x+3)+(3*x)/8-13/4 = 0
(1/4*4*8*(x+3))/(4*8)+(3*4*x)/(4*8)+(-13*8)/(4*8) = 0
1/4*4*8*(x+3)+3*4*x-13*8 = 0
20*x-104+24 = 0
20*x-80 = 0
(20*x-80)/(4*8) = 0
(20*x-80)/(4*8) = 0 // * 4*8
20*x-80 = 0
20*x-80 = 0 // + 80
20*x = 80 // : 20
x = 80/20
x = 4
x = 4
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