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81x+18-9+9=18x+90+54
Multiply both sides of the equation by 9.
81x+9+9=18x+90+54
Subtract 9 from 18 to get 9.
81x+18=18x+90+54
Add 9 and 9 to get 18.
81x+18=18x+144
Add 90 and 54 to get 144.
81x+18-18x=144
Subtract 18x from both sides.
63x+18=144
Combine 81x and -18x to get 63x.
63x=144-18
Subtract 18 from both sides.
63x=126
Subtract 18 from 144 to get 126.
x=\frac{126}{63}
Divide both sides by 63.
x=2
Divide 126 by 63 to get 2.