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2x+21=3x-6
21+6=3x-2x
27=x
2)
12(x-2) =1-x
12x-24=1-x
12x+x=1+24
13x=25
x=25\13
3)
x+5x-4=18-2x
x+5x+2x=18+4
8x=22
x=22\8
4)
3x-2+7x=7-1
3x+7x=7-1+2
10x=8
x=8\10
5)
4(2x+3)-2x=4x+20
8x+12-2x=4x+20
8x-2x-4x=20-12
2x=8
x=8\2
x=4
6)
34=3x-6+2x
34+6=3x+2x
40=5x
40\5=x
8=x