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-x/5 = -7/2 // + -7/2
-x/5-(-7/2) = 0
7/2-x/5 = 0
7/2-1/5*x = 0 // - 7/2
-1/5*x = -7/2 // : -1/5
x = -7/2/(-1/5)
x = 35/2
x = 35/2
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