Question

Cum se face 15-3,5·x=4,5; 2,5·(x+1,3)=10; (2,1: 0,7+6,9: 0,23):0,2-160=

Answer 1

15-3.5x=4.5
-3.5x=-10.5
x=3

2.5*(x+1.3)=10
2.5x+3.25=10
2.5x=6.75
x=2.7

(2.1:0.7+6.9:0.23):0.2-160=
(3+30):0.2=
33:0.2=
165-160=5