Question

cat este necunoscuta ? 1500-[130+(15×3+15×m)]×5=250

Answer 1

[130+(15 x 3+15 x m)] x 5=1500-250
[130+(45 +15 x m)] x 5=1250
130+(45 +15 x m)=1250:5
130+(45+15 x m)=250
45 +15 x m=250 - 130
45 + 15 x m=120
15 x m= 120-45
15 x m=75
m=75:15
m=3