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7+18=9x+3\left(3\times 3+1\right)
Multiply both sides of the equation by 9, the least common multiple of 9,3.
25=9x+3\left(3\times 3+1\right)
Add 7 and 18 to get 25.
25=9x+3\left(9+1\right)
Multiply 3 and 3 to get 9.
25=9x+3\times 10
Add 9 and 1 to get 10.
25=9x+30
Multiply 3 and 10 to get 30.
9x+30=25
Swap sides so that all variable terms are on the left hand side.
9x=25-30
Subtract 30 from both sides.
9x=-5
Subtract 30 from 25 to get -5.
x=\frac{-5}{9}
Divide both sides by 9.
x=-\frac{5}{9}
Fraction \frac{-5}{9} can be rewritten as -\frac{5}{9} by extracting the negative sign.