2x + 7=0-135
2x + 7=-135
2x=-135-7
2x=-142
x=-142:2
x=-71
1/2x + 3/2x=2014
x(1/2+3/2)=2014
2x=2014
x=2014:2
x=1007
a) ( 2x + 7) + 135 = 0
2x + 7 = -135
2x = -142
x = -71
b) \(\frac{1}{2}x+\frac{150}{100}x=2014\)
\(\frac{1}{2}x+\frac{3}{2}x=2014\)
\(\left(\frac{1}{2}+\frac{3}{2}\right)x=2014\)
\(2x=2014\)
\(x=1007\)
k nhé bn