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2x=4
x=2
2)5x-15=5
5x=20
x=4
3)2[2x-3]=2
4x-6=2
4x=8
x=2
3[x-1]+2=8
3x-3+2=8
3x=9
x=3
4[3x+2]+3=35
12x+8+3=35
12x=24
x=2
4[x-2]-5=3
4x-8-5=3
4x=16
x=4
2[x-4]+2=4
2x-8+2=4
2x=10
x=5