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(-1/7)*x-(3/4) = 0
(-1/7)*x-3/4 = 0
-1/7*x-3/4 = 0 // + 3/4
-1/7*x = 3/4 // : -1/7
x = 3/4/(-1/7)
x = -21/4
x = -21/4
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