## Elementary Geometry for College Students (7th Edition)

By expanding the brackets we have: $2x + 2\times 1 + 3x +3\times 2 = 22 + 4\times 10 -4x$ $5x + 8 = 62 -4x$ We add $4x$ to both sides and also subtract 8 from both sides: $5x + 4x = 62-8$ $9x = 54$ We divide by 9: $x = 54\div 9 = 6$