Question

3-х-800:4=25
(580-х):4=100
40:х+70=90

Answer 1

3-х-800:4=25
3-х -200=25
-х = 25+200-3
-х = 222
х=-222

(580-х):4=100
580 -х = 100×4
580-х =400
х= 580-400
х=180


40:х+70=90
40÷х=90-70
40÷х= 20
х= 40÷20
х=2