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5x=20
x=20/5
x=4
6x+3=15
6x=15-3
6x=12
x=12/6
x=2
2x^2-4x+x-2-2x^2-2x=3
-5x=3+2
-5x=5
x=5/-5
x=-1
4-2x-2=8
-2x=8+2-4
-2x=6
x=6/-2
x=-3