The end result is:
-2 + s
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You would subtract. For example, if you have 5-7, you would subtract the two like normal. And if you have 5+(-7) you would also subtract, because adding a negative number to a positive is the same as subtracting.
-5
-5 = 7 + 3r | subtract 7 -12 = 3r | divide by 3 -4 = r
Yes, x =7 and y = 4 is one of many solutions, if that is the only equation given.
Solving the equations y/7 +6 = 11 Subtract 6 from both sides: y/7 = 5 multiply both sides by 7: 7 = 35