7h - 2 - 51 is an expression NOT an equation. An expression cannot be solved for the value of a variable.
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comutity property
3 + h = 3 + 100.25 = 103.25
The solution to this equation is that h is equal to -4. You can substitute this value for h into the equation to get -4 x -9 - 6 plus 12 x -4 plus 40 equals 22, or 36 - 6 plus - 48 plus 40 equals 22.
Na+ plus OH- plus H+ equals H2O plus Na+ plus Cl-