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21=7(b+1
We move all terms to the left:
21-(7(b+1)=0
| 4x-7=2(18-x)+5 | | 36-2s=5(2s-3)+3 | | 3x-+7+2x=5x+7 | | w+2.8=43 | | t+5-4=3 | | -18+r=-28 | | 7x-15x=16 | | -7+-3t=-13 | | 19-3k=7 | | 36-2s=5(2s+3)+3 | | 7x+15=120 | | 17c=221 | | 4/3z=40 | | 3(6y-5)=-51 | | 4(m-1)=-4+4m | | -4/5(y+5)=4/5(y+4) | | 5x+3=2-6 | | 3r+1=3 | | 6=-2x+28x= | | 48=-2r+30 | | 60+30x=45 | | -9(7)=8(y-6.6) | | -2(-3b+4.8)=144 | | 4x+5=2x-+1 | | g(5)=-3(5)-3 | | 36+3v=7v | | 1/2m+6=17 | | 32000x-500=45000+1000 | | 8+g=300 | | 40-4(3z+5)=8 | | 2x+3(-3x+6)=4 | | 2226=21(p+35) |