Ayuda A Hacer Esto : -15x+12+3*(2x-6)= 3x-(21x-1)+2
-15x+12+3*(2x-6)= 3x-(21x-1)+2
-15x+12+6x-18=3x-21x+1+2
-9x-6=-18x+3
-9x+18x=3+6
9x=9
x=1
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-15x+12+3*(2x-6)= 3x-(21x-1)+2
-15x+12+6x-18=3x-21x+1+2
-9x-6=-18x+3
-9x+18x=3+6
9x=9
x=1