The equation which contains only one variable with the highest power of 1 is called linear equation in one variable.
For example, 2x + 1 = 7.
when RHS is equals to LHS... it's called an linear equation... and in one variable means we will use only variable in the whole equation (we generally use x)... like solve :- 2 + x = 5
now x = 5 - 2x = 3 (answer)
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answer is in the attachment
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2x-30,x=70 just prroved
110 hope it to u