Transpose 53 to RHS and y to LHS2y + y = 263 - 53→ 3y = 210→ 3y = 210→ y = 70Divide both sides by 3y = 70LHS → 2y + 53 = 2 × 70 + 53 = 140 + 53 = 193RHS → 263 - y = 263 - 70 = 193LHS = RHSHence proved.