Question 621208
{{{ 4x + 3(x-2) = 18 - x }}} 
{{{ 4x + 3x - 6 = 18 - x }}}
{{{ 7x - 6 = 18 - x }}}
Add {{{ x }}} to both sides
{{{ 8x - 6 = 18 }}}
Add {{{ 6 }}} to both sides
{{{ 8x = 18 + 6 }}}
{{{ 8x = 24 }}}
Divide both sides by {{{ 8 }}}
{{{ x = 3 }}}
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Check answer by plugging 
this value back into equation
{{{ 4x + 3(x-2) = 18 - x }}} 
{{{ 4*3 + 3*(3-2) = 18 - 3 }}} 
{{{ 12 + 3*1 = 15 }}}
{{{ 15 = 15 }}}
OK