Solve for x
x=123.2
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1.2\times 31=x-86
Multiply both sides by 31.
37.2=x-86
Multiply 1.2 and 31 to get 37.2.
x-86=37.2
Swap sides so that all variable terms are on the left hand side.
x=37.2+86
Add 86 to both sides.
x=123.2
Add 37.2 and 86 to get 123.2.
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