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We solve as follows:
[tex](1-6x)+(7x+3)=x+4[/tex][tex](-4x+4)-(8x+7)=-12x-3[/tex][tex](-x-3)+(3x+8)=2x+5[/tex][tex](7+a)-(-7a+1)=8a+6[/tex][tex](-3k-1)+(7+2k)=-k+6[/tex]