Question

Write the following statement by using appropriate grouping symbols:
Three times the sum of $2x+y\{5-(x-3y\left)\right\}$ and $7x-4y+3$ is subtracted from $3x-4y+7$.

Answer 1

Three times the sum of $2x+y\{5-(x-3y\left)\right\}$ and $7x-4y+3$ is written as

$=3\left[\right(2x+y–\{5–(x–3y\left)\right\})+(7x–4y+3\left)\right]$

Now,

This is subtracted from $3x–4y+7$

Thus, the required expression is $(3x–4y+7)–3\left[\right(2x+y–\{5–(x–3y\left)\right\})+(7x–4y+3\left)\right]$