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(61/2)*(2*x-10) = 4 // - 4
(61/2)*(2*x-10)-4 = 0
61/2*(2*x-10)-4 = 0
61/2*(2*x-10)-4 = 0
61*x-309 = 0
61*x-309 = 0
61*x-309 = 0 // + 309
61*x = 309 // : 61
x = 309/61
x = 309/61
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