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7x/9-5x=21
We move all terms to the left:
7x/9-5x-(21)=0
We add all the numbers together, and all the variables
-5x+7x/9-21=0
We multiply all the terms by the denominator
-5x*9+7x-21*9=0
We add all the numbers together, and all the variables
7x-5x*9-189=0
Wy multiply elements
7x-45x-189=0
We add all the numbers together, and all the variables
-38x-189=0
We move all terms containing x to the left, all other terms to the right
-38x=189
x=189/-38
x=-4+37/38
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