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-15x+12+3(2x-6)=3x-(21x-1)+2
-15x+12+6x-18=3x-21x+1+2
-15x+6x-3x+21x=18-12+3
9x=9
x=1
-15X+12+6X-18=3X-21X+1+2
-9X-6= -18X+3---> 9X=9--->X=1