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Answer:5
Step-by-step explanation:
Answer:
In mathematics, an algebraic expression is an expression built up from integer constants, variables, and the algebraic operations. For example, 3x² − 2xy + c is an algebraic expression.


10x−28=3x+56
10x=3x+56+28
10x=3x+84
10x−3x=84
7x=84

x=12
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