Question 117915



let number be {{{x}}}

{{{3x + 7 = 19}}}......add {{{-7}}} to the both sides

{{{3x + 7-7 = 19 - 7}}}

{{{3x  = 12}}}......both sides divide by {{{3}}}

{{{3x/3 = 12/3}}}

{{{x = 4}}}