(X - 30) does.
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If you add what you subtracted, you get the original number. If you subtract what you added you get the original number. 40-10=30 30+10=40
7 hours subtracted by 30 minutes = -23
1980 subtracted by 2010 = -30
You said that " 7x - 4x = 30 ".From only that much information, I can see that 3x must be 30,which leads me directly to the realization that 'x' is 10 .
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