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-20 = -4x - 6x-20 = -10x20 = 10x2 = x
9/10x20=180/10=18
The answer depends on the units used for 10x20. It should be blindingly obvious to anybody that the answer for 10 ft x 20 ft will be quite different to that for 10 yards x 20 yards.
-6x^2 - 78x - 252 Improved answer: -6x+6x+7 When simplified = 7
There is none because it's not an equation