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(3*x)/5-(7/5) = 4 // - 4
(3*x)/5-(7/5)-4 = 0
(3*x)/5-7/5-4 = 0
3/5*x-27/5 = 0 // + 27/5
3/5*x = 27/5 // : 3/5
x = 27/5/3/5
x = 9
x = 9
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