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-3x - 1 = 20 + 4x
1) the first thing you want to do is have the variable(x) in one side of the equation. so subtract so add -3x to 4x.
-1 = 20 + 7x
2) now you want to isolate the variable so subtract 20 to -1.
-21 = 7x
3) to solve for x you need to divide by 7 on both sides and 7x divided by 7 is one or just x and whatever you do to one side you must do to the other -21 divided by 7 is -3
x = -3
What else can I help you with?
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