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(1/5)*(2*x+5) = 4 // - 4
(1/5)*(2*x+5)-4 = 0
1/5*(2*x+5)-4 = 0
1/5*(2*x+5)-4 = 0
2/5*x-3 = 0
2/5*x-3 = 0
2/5*x-3 = 0 // + 3
2/5*x = 3 // : 2/5
x = 3/2/5
x = 15/2
x = 15/2
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