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x=10-3
x=7
2. x-8=12
x=12+8
x=20
3. x+15=0
x=-15
4.3x=15
x=15/3
x=5
5. -5x=20
x=20/-5
x=-4
6. 2x+1=5
2 x=5-1
x=4/2
x=2
7. 2(x+1)=10
2x+2=10
2x=10-2
x=8/2
x=4