Is this number sentence true or false for every value of $m$m?

$m+1=1+m$m+1=1+m

True

False

Is this number sentence true or false for every value of $g$g?

$g\times3=3\times g$g×3=3×g

Is this number sentence true or false for every value of $n$n?

$-5+n=n-5$−5+n=n−5

Is this number sentence true or false for every positive value of $v$v?

$v\div3=3\div v$v÷3=3÷v

Form and solve simple linear equations