Solve for x
x=3
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4.5+1.5x+3x=18
Add 3x to both sides.
4.5+4.5x=18
Combine 1.5x and 3x to get 4.5x.
4.5x=18-4.5
Subtract 4.5 from both sides.
4.5x=13.5
Subtract 4.5 from 18 to get 13.5.
x=\frac{13.5}{4.5}
Divide both sides by 4.5.
x=\frac{135}{45}
Expand \frac{13.5}{4.5} by multiplying both numerator and the denominator by 10.
x=3
Divide 135 by 45 to get 3.
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