可以，用错项相消法！（受之以鱼，不如受之以渔）
1/4(x-3)+1/5(x-4)+1/6(x-5)+1/7(x-6)=-4==>1/4x+1/5x+1/6x+1/7x-3/4-4/5-5/6-6/7=-4==>1/4x+1/5x+1/6x+1/7x-1+1/4-1+1/5-1+1/6-1+1/7=-4==> (1/4+1/5+1/6+1/7)x=-(1/4+1/5+1/6+1/7)==> x=-1
