X=4
cross multiply
3x=12
x=4
<span>3.7 since the digit after the tenths digit is less than five</span>
The simplified form of the expression is 
<h3>Simplifying an expression</h3>
From the question, we are to simplify the given expression
The given expression is

The expression can be simplified as shown below





Then,





Hence, the simplified form of the expression is 
Learn more on Simplifying an expression here: brainly.com/question/2320607
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81 - 35+30 (55) = 26 therefore 26cm is ur final answer