Question

4 × + 20 =180

3 × - 15 = 145

16 × =1240

18 × = - 8120

Answer 1

4x=180-20 => 4x=160=>x=160/4=40

3x=145+15 =>3x=160 =>x=160/3

16x=1240 =>x=1240/16 = x=77,5

x=-8120/18 => x=-451,11