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12x - 4 = 7x - 21 12x -7x = -21 + 4 5x = -17 x = -3.4
If you mean: 7x+21 = 105 Then the solution is: x = 12
y=mx+b 7x+3y=21 3y=21-7x *****_ y=7-2.3x *****_ m= -2.3 negative
x-3-7x=21 -6x=21+3 6x=-24 x=-4
-3x=-21+4x-3x-4x=-21+4x-4x-7x=-217x=217x/7=21/7x=3