3x=10
x=10/3
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4x + 10 + 3x = 40 - 3x 4x + 10 + 3x + 3x = 40 20x = 40 x = 2
3x+7=37 -7 -7 3x=30 /3 /3 x=10
13-3x = 43 -3x = 43-13 -3x = 30 x = -10
5x - 4 = 3x + 6 5x - 3x = 6 + 4 2x = 10 x = 5
If you factor x2 - 3x - 10, you'll get (x-5) (x+2). If your equation is x2 - 3x -10 = 0, then x = 5, and x = -2.