X + 25 = 8 × 5. 52 - х = 64 ÷ 2. × - 27 = 100 ÷ 2
Х+25=8*5, х=40-25, х=15, 52-х=64:2, -х=128-52, -х=76, х= -76, х-27=100:2, х=50+27, х=77.