12 + x = 25
remember you r trying to isolate the x
start by minusing 12 from both sides
x= 25-12
so x=13
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m-12=25. m=37
x=-.25.
25
17 + 11 + (25-12) = 17 + 11 + 25 - 12 = 41.
4a + a = 25 add 4a and a 5a = 25 then divide 25 by 5 a = 5