Question

Daca a -2b=18,aflati X in fiecare din situatiile : a) X+3a-6b=100; b) 7a-14b -X =20

Answer 1

a)×+3a-6b=100
×+3(a-2b)=100
×+3*18=100
×+54=100
×=100-54
×=46
b)7a-14b-×=20
7(a-2b)-×=20
7*18-×=20
126-×=20
126-20=×
X=106