251−x×5x+2÷(1125)x=625−1
(52)(1−x)×5(x+2)÷(5−3)x=(54)−1
52−2x×5x+2÷5−3x=5−4
5(2−2x)+(x+2)−(−3x)=5−4
Equating bases, we have
2−2x+x+2+3x=−4
4+2x=−4implies2x=−4−4
2x=−8
x=−4