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-3*x-4 = -37/7 // + -37/7
-3*x-(-37/7)-4 = 0
37/7-3*x-4 = 0
9/7-3*x = 0 // - 9/7
-3*x = -9/7 // : -3
x = -9/7/(-3)
x = 3/7
x = 3/7
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