Question

ajutatima cu aceste exercitii va rog
45+x+7=65
x+13+20=90
30+7-x=15-6

Answer 1

45+x+7=65
x+52=65
x=65-52
x=13

x+13+20=90
x+33=90
x=90-33
x=57

30+7-x=15-6
37-x=9
x=37-9
x=28