7x
5x
-3x
1 + 3a
-3 -a
a + 7b
-6a +8b
28y
2y
-4y
-5a
3x+4x=7x
6x-x=5x
-8x+5x=-3x
x-4x=-3x
2a+1+a=3a+1
4a-5a-3=-a-3
-5a+7b+6a=a+7b
6b-6a+2b=-6a+8b
4*7y=28y
12y:6=2y
-(8y)* ½=-8y*½=-4y
10a:(-2)=-5a
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7x
5x
-3x
-3x
1 + 3a
-3 -a
a + 7b
-6a +8b
28y
2y
-4y
-5a
3x+4x=7x
6x-x=5x
-8x+5x=-3x
x-4x=-3x
2a+1+a=3a+1
4a-5a-3=-a-3
-5a+7b+6a=a+7b
6b-6a+2b=-6a+8b
4*7y=28y
12y:6=2y
-(8y)* ½=-8y*½=-4y
10a:(-2)=-5a