If it's not what You are looking for type in the equation solver your own equation and let us solve it.
x in (-oo:+oo)
x/2 = 200 // - 200
x/2-200 = 0
1/2*x-200 = 0 // + 200
1/2*x = 200 // : 1/2
x = 200/1/2
x = 400
x = 400
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