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This is not possible to "solve" as such. 3x + 4x = 7x, which is the same as 7x=7x. Clearly, you end up with x=x, which is true, but not useful.
This suggests that you have used the wrong method when trying to solve the problem, however your algebra was correct, since x does indeed equal x; it's when you end up with something like 2=1, or 1=0, that you have to worry.
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How do you solve 7x plus 12 equals 3x?
7x = 3x - 12 4x=-12 x=-3
-3x equals -21 plus 4x?
-3x=-21+4x-3x-4x=-21+4x-4x-7x=-217x=217x/7=21/7x=3
How do you slove 3x plus 1 plus 4x-5 equals 31?
combine like terms. 3x+1+4x-5=31 3x+4x=7x 7x+1-5=31 1-5=-4 7x-4=31 then solve it 7x=35 x=5
-3x plus 4x equals 7x?
No, that's not correct.-3x + 4x = x
How do you solve 4x subtract 9 equals 7x?
You subtract 4x from 7x with equals 3x so your equation then becomes 9 = 3x.Now you divide 3 from 3x which leaves the x by it's self then divide 3 from 9. The answer would be 3=x
