exam Maths Puzzle Numerical Ability

when dividing 12x*2-7x+18/ -4x does it make a difference in the way you work the problem because it has a negative 4? I understand how to divide it without the number being a negative. Thanks

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exam Other Question
after you find x, your supposed to substitue it in. I dont know how to find y. How many gallons of a 60 percent acid solution must be mixed with 80 gallons of a 14 percent solution to obtain a solution that is 50 percent acid?