Răspuns:
x+2=9
x=9-2
x=7
3x-1=8
3x=8+1
3x=9
x=9÷3
x=3
4x-9=3
4x=3+9
4x=12
x=12÷4
5x-9=1
5x= 1+9
5x=10
x=10÷5
x=2
3-2x=7
-2x=7-3
-2x=4
x= 4÷(-2)
x= -2
2-x=8
-x=8-2
-x=6
x=6÷(-1)
x=-6
4=x-2
x=4+2
x=6
3x+1=10
3x=10-1
7x+15=1
7x=1-15
7x=-16
x=-16:7
x=-2,285
3-4x=15
-4x=15-3
-4x=12
x=12÷(-4)
x=-3
x+3=1
x=1-3
x=-2
7-2x=9
-2x=9-7
-2x=2
x=2÷(-2)
x=-1
V,11
4(x+1)-3=3(x-1)+7
4x+4-3=3x-3+7
4x+1=3x+4
4x-3x=4-1
12
5(4x+3)+7=3(x+2)-1
20x+15+7=3x+6-1
20x+22=3x+5
20x-3x=5-22
17x= -17
x= -1
Explicație pas cu pas:
