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原式可化為:(x-3)(x-3+4x)=0∴x-3=0或5x-3=0解得x1=3,x2=35.
原式等於4x减十五分之八,加十五分之八,等於十五分之七,加十五分之八.然後4x等於一.x等於0.25.
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