A) 3x+7+x=5x-7+3x
7+7=5x
14=5x |:5
x=2.8
B)12-x-7=15-4x
3-7=-3x
-4=-3x |:(-3)
x=1
C)-5(x-3)=7(2-x)
-5x+15=14-7x
1=-2x |:(-2)
x=-
D)7-2(2-x)=3(x-1)-3
7-4+2x=3x-3-3
3+2x=3x-6
x=9
A)
3x+7+x=5x-7+3x
B)
12-x-7=15-4x
C)
-5(x-3)=7(2-x)
D)
7-2(2-x)=3(x-1)-3
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A) 3x+7+x=5x-7+3x
7+7=5x
14=5x |:5
x=2.8
B)12-x-7=15-4x
3-7=-3x
-4=-3x |:(-3)
x=1
C)-5(x-3)=7(2-x)
-5x+15=14-7x
1=-2x |:(-2)
x=-
D)7-2(2-x)=3(x-1)-3
7-4+2x=3x-3-3
3+2x=3x-6
x=9
A)
3x+7+x=5x-7+3x
7+7=5x
14=5x |:5
x=2.8
B)
12-x-7=15-4x
3-7=-3x
-4=-3x |:(-3)
x=1
C)
-5(x-3)=7(2-x)
-5x+15=14-7x
1=-2x |:(-2)
x=-
D)
7-2(2-x)=3(x-1)-3
7-4+2x=3x-3-3
3+2x=3x-6
x=9