Question 61300
{{{3x - 6 = 4x -18}}}

Add 6 to both sides: {{{3x = 4x-12}}}.
Subtract 3x from both sides: {{{0 = x-12}}}.
Add 12 to both sides: {{{12 = x}}}.

Verify: {{{3(12) - 6 = 36 - 6 = 30}}}.
And, {{{4(12) - 18 = 30}}}.