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x=10+5
x=15
2x+10=18
2x=18-10
2x=8
x=8/2=4
-5x+8=2x-6
-5x-2x=-6-8
-7x=-14
x=14/7=2
x+2x-1=5
3x=5+1
3x=6
x=6/3=2