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21\times 4+1512=312+56\times 2x
Multiply both sides of the equation by 168, the least common multiple of 8,7,3.
84+1512=312+56\times 2x
Multiply 21 and 4 to get 84.
1596=312+56\times 2x
Add 84 and 1512 to get 1596.
1596=312+112x
Multiply 56 and 2 to get 112.
312+112x=1596
Swap sides so that all variable terms are on the left hand side.
112x=1596-312
Subtract 312 from both sides.
112x=1284
Subtract 312 from 1596 to get 1284.
x=\frac{1284}{112}
Divide both sides by 112.
x=\frac{321}{28}
Reduce the fraction \frac{1284}{112} to lowest terms by extracting and canceling out 4.