Bài 5:
a: 2x-15=-11-(-16)
=>2x-15=-11+16
=>2x-15=5
=>2x=15+5=20
=>x=20/2=10
a: -7-2x=-37-(-26)
=>-2x-7=-37+26
=>-2x-7=-11
=>-2x=-4
=>x=2
b: 3-(17-x)=289-(36+289)
=>3-17+x=289-36-289
=>x-14=-36
=>x=-36+14
=>x=-22
b: 34+(21-x)=(3747-30)-3747
=>34+21-x=-30
=>55-x=-30
=>x=55+30
=>x=85
Bài 4:
a: 5-(4-x)=6
=>5-4+x=6
=>x+1=6
=>x=6-1
=>x=5
a: 25+(-2+x)=5
=>x-2+25=5
=>x+23=5
=>x=5-23
=>x=-18
a: -26-(x-7)=0
=>-26-x+7=0
=>-19-x=0
=>x+19=0
=>x=-19
a: x+13=32-76
=>x+13=-44
=>x=-44-13
=>x=-57
a: x+20=95-75
=>x+20=20
=>x=20-20
=>x=0
a: x+7=(-5)+(-3)
=>x+7=-8
=>x=-8-7=-15
c: 3-x=15-(-5)
=>3-x=15+5
=>3-x=20
=>x=3-20
=>x=-17
c: 2-x=17-(-5)
=>2-x=17+5
=>2-x=22
=>x=2-22
=>x=-20
c: 11-x=8-(-11)
=>11-x=8+11
=>-x=8
=>x=-8
