Question 286943
3(-n)-7 means: The opposite of a number is tripled then decreased by 7.
=2n+3 means: The result is 3 greater than twice the number. What is the number?
{{{3(-n)-7=2n+3}}}solve for n, use PEMDAS.
{{{(-3n)-7=2n+3}}}add 3n
{{{-7=5n+3}}}subtract 3
{{{-10=5n}}}
{{{highlight(-2=n)}}}
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check
{{{3(-n)-7=2n+3}}}
{{{3(-(-2))-7=2(-2)+3}}}
{{{3(2)-7=(-4)+3}}}
{{{6-7=-1}}}
{{{-1=-1}}}
correct