Solve for x
x=10.5
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13.5\times 3=30+x
Multiply both sides by 3.
40.5=30+x
Multiply 13.5 and 3 to get 40.5.
30+x=40.5
Swap sides so that all variable terms are on the left hand side.
x=40.5-30
Subtract 30 from both sides.
x=10.5
Subtract 30 from 40.5 to get 10.5.
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