98+a=425 Subtract 98 from both sides; 98-98 + a= 425-98 a=327
M-708=292 Add 708 to both sides; M-708+708= 292+708 M=1000
Just do inverse operation, where if you have a subtraction sign in front of a number, you add that same number to it, vice versa for addition. just make sure to do the same to the number on the other side of the equal sign though.
