Question

ex 5 Help...DAU COROANĂ

Answer 1

A))
X+3•(a-b) = 20
X+3•6=20
X+18=20
X=20-18
X= 2
B))
X•(a-b)+9(a-b)=654
X•6+9•6=654
X•6+54=654
X•6=654-54
X•6=600
X=600:6
X=100
C))
7•(a-b)+x= 55
7•6+x= 55
42+x=55
X=55-42
X= 13
D))
X-5•(a-b)=2011-13
X-5•6=1998
X-30=1998
X= 1998+30
X= 2028
Sper ca te-am ajutat !