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First we need a common denominator to change the fractions to equavalent fractions and thus get rid of all fractions. In this case the common denominator is 35.
21x-14-25x-5 = 5x-55 Combine like terms
-4x-19 =5x-55
9x = 36
x= 4
Check:
2- 3 = -1
-1=-1