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