Question

х-30=60 решить и 100-х=40

Answer 1

x-30=60
x=60+30
x=90
90-30=60
60=60

100-x=40
x=100-40
x=60
100-60=40
40=40

Answer 2

X=60+30
X=90
100-X=40
X=100-40
X=60