1) 5[x-4(1-2x)-6]-3(x=10)=40x-12
2) 5[x-4+8x-6]-3(x=10)=40x-12 Distribute "-4"
3) 5[9x-10]-3(x+10)=40x-12 Simplify
4) 45x-50-3x-30=40x-12 Distribute the "5" and "-3"
5) 42x-30=40x-12 Simplify
6) 2x-30=-12 Subtract 40x to both sides
7) 2x=18 Add 30 to both sides
8) x=9 Divide both sides by 2