Geometry: Common Core (15th Edition)

Start with the given equation. $(10x+5)+(6x-1)=180$ Combine like terms. $16x+4=180$ Subtract 4 from each side and simplify. $16x+4-4=180-4$ $16x=176$ Divide each side by 16 and simplify. $16x\div16=176\div16$ $x=11$