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15-3a
15-a
15-3a
15-3a
15-a
15-3a
15-3a
15-a
b)
7x-2
7x-2
7x-2
7x-4
7x-2
7x-2
6x+3
7x-2
5-3a+5-a+a+5=-3a +15
a+4+7-3a+4-a=-3a+15
6-a+5-3a+a+4=-3a+15
a+3+5-a+7-3a=-3a+15
6-3a+a+5+4-a=-3a+15
6-a+5-a+4-a=-3a+15
a+4+5-a+6-3a=-3a+15
2x-1+2x-2+3x+1=7x-2
4x-2+2x+1+x-1=7x-2
x+1+3x-1+3x-2=7x-2
2x-1+4x-2+x-1=7x-4
2x-2+2x+1+3x-1=7x-2
3x+1+x-1+3x-2=7x-2
x+1+2x+1+3x+1=6x+3
2x-1+2x+1+3x-2=7x-2