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(3/8)*(-7*x-2) = -5 // + 5
(3/8)*(-7*x-2)+5 = 0
3/8*(-7*x-2)+5 = 0
3/8*(-7*x-2)+5 = 0
17/4-21/8*x = 0
17/4-21/8*x = 0
17/4-21/8*x = 0 // - 17/4
-21/8*x = -17/4 // : -21/8
x = -17/4/(-21/8)
x = 34/21
x = 34/21
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