SubtractSides

SubtractSides[rel,x] subtracts x from each side of the equation or inequality rel.

SubtractSides[rel1,rel2] subtracts the corresponding sides of two equations or inequalities.

SubtractSides[rel] subtracts the right-hand side of rel from each side, producing a zero right-hand side.

Please visit the official Wolfram Language Reference for more details and examples on core symbols.