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(1/5)*(2*x-15)+(3/5)*x = 1/4+4 // - 1/4+4
(1/5)*(2*x-15)+(3/5)*x-(1/4)-4 = 0
(1/5)*(2*x-15)+(3/5)*x-1/4-4 = 0
1/5*(2*x-15)+(3*x)/5-1/4-4 = 0
(1/5*4*5*(2*x-15))/(4*5)+(3*4*x)/(4*5)+(-1*5)/(4*5)+(-4*4*5)/(4*5) = 0
1/5*4*5*(2*x-15)+3*4*x-1*5-4*4*5 = 0
20*x-80-60-5 = 0
20*x-80-65 = 0
20*x-145 = 0
(20*x-145)/(4*5) = 0
(20*x-145)/(4*5) = 0 // * 4*5
20*x-145 = 0
20*x-145 = 0 // + 145
20*x = 145 // : 20
x = 145/20
x = 29/4
x = 29/4
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