Neha is five years younger to Karishma. Twelve years ago, Karishma was twice as old as Neha. Convert it into an algebraic equation.

Write the following as algebraic expressions in one literal or variable. Also mention what the literal represents?

The expression obtained by taking the sum of four times the smallest and twice the biggest of three consecutive integers.

Write the following as algebraic expressions in one literal or variable. Also mention what the literal represents?

The length of a rectangle is $5 \mathrm{m}$ less than twice the width. Write the expression for the perimeter if the length is decreased by $3 \mathrm{m}$ and width is increased by $2 \mathrm{m}$.

What should be added to $x^2+xy+y^2$ to get $2x^2+3xy$?

What should be subtracted from $2a+8b+10$ to get $-3a+7b+16$?

What should be taken away from $3x^2-4y^2+5xy+20$ to obtain $-x^2-y^2+6xy+20$?

From the sum of $3x-y+11$ and $-y-11$, subtract $3x-y-11$.

From the sum of $4+3x$ and $5-4x+2x^2$, subtract the sum of $3x^2-5x$ and $-x^2+2x+5$. 

If $m=2$ find the value of

$m-2$