Question 30372
4(1-3X)+7=9 EXPANDED BECOMES 4-12X+7X=9 OR 4-5X=9 OR -5X=5 OR X=-1

PROOF 4(1-3(-1))+7(-1)=9 OR 4(1+3)-7=9 OR 4(4)-7=9 OOR 16-7=9 THUS 9=9.