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Ok so your equation reads like this (I assume you forgot the +):
3 - 4x = 10x +10
The goal is to get the x's on one side and the other numbers on the other. It doesnt matter which side has which, so I will move the numbers to the right and the x's to the left. So first subtract 3 from both sides:
3 - 3 - 4x = 10x + 10 - 3
-4x = 10x + 7
Now subtract 10x from both sides.
-4x - 10x = 10x - 10x + 7
-14x = 7
Now that we have like terms on both sides, all you need to do is divide both sides by -14 to solve for x.
-14x / -14 = 7 / -14
x = -1 / 2
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