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(1/5)*(10*x-1) = 4 // - 4
(1/5)*(10*x-1)-4 = 0
1/5*(10*x-1)-4 = 0
1/5*(10*x-1)-4 = 0
2*x-21/5 = 0
2*x-21/5 = 0
2*x-21/5 = 0 // + 21/5
2*x = 21/5 // : 2
x = 21/5/2
x = 21/10
x = 21/10
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