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13+2x=3
2x= 3-13
2x= -10 / :2
x= -5
b)
-7=5x+1
-7-1=5x
-8=5x / :5
-1,6=x
c)
7x-21=5x
7x-5x=21
2x=21 / : 2
x= 10,5
d)
6y-13=-52
6y= -52+13
6y= -39 / : 6
y= - 6,5
e)
4x-4=3
4x= 3+4
4x= 7 ?/: 4
x = 1.75
f)
3c+2=-70
3c=-70-2
3c= -72 / :3
c= -24
g)
33-4x=4x
33= 4x+ 4x
33= 8x / : 8
4.125 = x
h)
5-10x=-2x
-10x+2x= 5
-8x= 5 / : (-8)
x= - ⅝