It depends what x is. If you do not know the value of either variable it would be 2x.
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4X
You will learn MX+B in algebra. M is the slope, X can be any number, and B is the y-intercept. :)
x2
Looking at this as an algebra equation, x + 82 = 180, all you need to do is isolate x. To do this, subtract 82 from both sides of the equation to get x = 98.
3c