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2x+7=13
2x=6
X=6:2
X=3
4x+5=2x+20
4x-2x=20-5
2x=15
X=15/2
5x-36=44
5x=44+36
5x=80
X=80:5
X=9
7x-8=2x+4
7x-2x=4+8
5x=12
X=12/5
3x-12=-x+14
3x+x=14+12
4x=26
X=26/4
X=13/2
7x-13=-5-36
7x=5-36+13
7x=-18
X=-18/7