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(1/5)*(2*x-15)+(3/5)*x = 41-4 // - 41-4
(1/5)*(2*x-15)+(3/5)*x-41+4 = 0
1/5*(2*x-15)+(3*x)/5-41+4 = 0
(1/5*5*(2*x-15))/5+(3*x)/5+(-41*5)/5+(4*5)/5 = 0
1/5*5*(2*x-15)+3*x-41*5+4*5 = 0
5*x-205-15+20 = 0
5*x-220+20 = 0
5*x-200 = 0
(5*x-200)/5 = 0
(5*x-200)/5 = 0 // * 5
5*x-200 = 0
5*x-200 = 0 // + 200
5*x = 200 // : 5
x = 200/5
x = 40
x = 40
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