Question 921290

let's a number be {{{x}}}

given:

the sum of {{{10}}} and a number is {{{3}}} times the number:

{{{10+x=3x}}} now we can find a number 

{{{10=3x-x}}}

{{{10=2x}}}

{{{10/2=x}}}

{{{5=x}}}


check:

{{{10+x=3x}}}

{{{10+5=3*5}}}

{{{15=15}}}