1. The problem statement, all variables and given/known data This is the problem: |4(x+2) - 7(x-y) = 7 |7(x+y) + 10(x-2) = 79 I need to solve this, I'm not quite sure what to do, the operators in the brackets are different, so even if I multiply by -1, if the operator in front of one variable changes, the other one will change too, still making them incompatible with the bottom one. 2. Relevant equations 3. The attempt at a solution I tried going the straight way by just doing all the operations until I get them to a simple as possible state: |4(x+2) - 7(x-y) = 7 |7(x+y) + 10(x-2) = 79 into: |4x + 7y + 1 = 0 |10x + 7y -99 = 0 This however doesn't get me anywhere.Could someone offer some help?(I know the problem sounds way too stupid :( ) Combining them gives me: 14x+ 14y - 98 = 0 ,which I turn into: x + y - 7 = 0 , which still doesn't really get me anywhere, x + y = 7.The book says the answer is 5 and 2, but not sure how to solve it properly.