2y+7=5x-21
2y-5x+7=-211
-5x+2y=-211-7
5x-2y=28
-6(2x+1)=12x+2 (x+36)
-12x-6=12x+2 (x+36)
-12-6=14x+72
-12x-14x-6=72
-26x=72+6
X=-3
2y+7=5x-21
2y-5x+7=-211
-5x+2y=-211-7
5x-2y=28
-6(2x+1)=12x+2 (x+36)
-12x-6=12x+2 (x+36)
-12-6=14x+72
-12x-14x-6=72
-26x=72+6
X=-3