Multiply both Sides

What: Multiply both sides of == by the same expression.
Why: Such side-wise multiplication is an essential computation for solving equations.   
Time to Complete: 4 hours. 
eq = (x - 3 == y / 13);
lhs = eq.left * 13; 
rhs = eq.right * 13;
eq2 = (lhs == rhs);
show eq2;
Output
"eq2" → 13*(-3 + x) == y
Output
   
"eq2" → 13*(-3 + x) == y
Apply expand[ ] to one side
eq = (x - 3 == y / 13);
lhs = eq.left * 13; 
rhs = eq.right * 13;
eq2 = (lhs == rhs);
show eq2;
lhs = expand[eq2.left]; 
rhs = eq2.right;
eq3 = (lhs == rhs);
show eq3;
save as lhsrhs;
Output
   
"eq2" → 13*(-3 + x) == y
"eq3" → -39 + 13*x == y
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