(163 - х) - 117 = 0 (456 + 112) - x = 400 145 - (х + 45) = 50 x - (203 + 303) = 34 (39 + х) - 27 = 22 468 - 217 - х = 51
163-x-117=0 x=163-117 x=46 456+112-x=400 x=456+112-400 x=168 145-x-45=50 x=145-45-50 x=50 x-203-303=34 x=34+203+303 x=540 39+x-27=22 x=22-39+27 x=10 468-217-x=51 x=468-217-51 x=200