1.
2x+5=7
2x=2
x=1
2.
4x+3=3x+7
x=7-3
x=4
3.
3x+5+2x=5
5x=0
x=0
4.
2x+2(x+1)=0
2x+2x+2=0
4x=-2
x=-1/2
5.
2(x+1)+4=x+2
2x+2+4=x+2
2x+6=x+2
x=-4
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1.
2x+5=7
2x=2
x=1
2.
4x+3=3x+7
x=7-3
x=4
3.
3x+5+2x=5
5x=0
x=0
4.
2x+2(x+1)=0
2x+2x+2=0
4x=-2
x=-1/2
5.
2(x+1)+4=x+2
2x+2+4=x+2
2x+6=x+2
x=-4
20 + 30 + 12 + 12 =24 +20
74=44 /:2
37=22
b)2(6+3)=7(7+3)
12+6=49+21
18=70 /:2
9=35
c)4(7+6)=3(9+5)
28+24=27+15
52=42 /;2
26=21
d)2(3+4)=3(7+7)
6+8=21+21
14=42 /;2
7=21
e)3(3-3)=4(4-4)
9-9=12-2
0=0