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21.3(x+3)=9+x
22.6(x/2+1)=12
23.9(x+6)=63
24.2+x=2(x-1/2)
25.8x+3(1-x)=-2
26.7+x-2(x-1)=1
27.x/3?-5?=?(5-x)/2
28.2(x+1)?/3=5(x+1)?/6?-1
29.(1/5)x?+1?=(2x+1)/4
30.(5-2)/2?-?(4+x)/3?=1