First, make 2 into a fraction by putting it over 1.
1 2
÷
2 1
Then using the keep, change, flip method or the multiply by the reciprocal (opposite) change the fractions so that the division sign is multiplication, and switch the second number's numerator and denominator, and multiply across.
35 + 52 + 3(x + 2) = 180 87 + 3x + 6 = 180 ( add the like terms and use distributive property) 93 + 3x = 180 -93 -93 3x = 87 ÷3 ÷3 x = 29 ( the sum of all triangle angles is 180)
