It has no solution. Equations have solutions, but expressions have not.
Had you asked, 'What is the solution to -2x + 5 + 21 = 0 ?', then I would reply,
'26 = 2x; therefore, x = 13',
is your solution.
You can check this, to see whether it is true.
The equation is clearly true, if we substitute 13 for x:
-2(13) + 5 + 21 = -26 + 5 + 21 = 0.
The moral is that equations are statements and may be true or false. Mere expressions are not statements, and they are therefore neither true or false.
2x+3 = 3x+5 2x-3x = 5-3 -x = 2 x = -2
2x + 21 = 97 2x = 76 x = 38 Check it. 5 x 38 + 21- 3 x 38 190 + 21 - 114 211 - 114 = 97 It checks.
3x-5
x = -5
5 - 2x = 8 x = -1 and 1/2 4x = 6 x = 6/4 or 3/2
2x+3 = 3x+5 2x-3x = 5-3 -x = 2 x = -2
2x + 5 = 192x + 5 - 5 = 19-52x = 142x/2 = 14/2x = 7
2x + 21 = 97 2x = 76 x = 38 Check it. 5 x 38 + 21- 3 x 38 190 + 21 - 114 211 - 114 = 97 It checks.
3x-5
X = 6
x = -5
5 - 2x = 8 x = -1 and 1/2 4x = 6 x = 6/4 or 3/2
4+2x-2x+1=13+6 Combine like terms. (4+1=5; 2x-2x=0; 13+6=19) 5=19 This problem has no solution.
X=2
645375
2x-6 < 5+7x 2x-7x < 5+6 -5x < 11 x > -2.5
7x-1=2x+5 7x-2x=5+1 5x=6 x=6/5=1.2