Question 664141
Just in case you are yet in need of a solution...
{{{v=(1/6)ab(x+y)}}}
Solving for x
Distribute {{{(1/6)ab}}}
{{{v=(1/6)abx + (1/6)aby}}}
Subtract {{{(1/6)aby}}} from both sides
{{{v - (1/6)aby = (1/6)abx}}}
Multiply both sides by {{{6/(ab)}}}
{{{(6(v-(1/6)aby))/ab) = x}}}
Simplify
Distribute the 6
{{{(6v)/(ab)-((1/6)6aby)/ab=x}}}
Further simplify with cancelations
{{{(6v/ab)-y = x}}}

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