Question

3x + 9x = 135 find the value of x​

Answer 1

Answer:

$3x + 9x = 135 \\ 12x = 135 \\ x = \frac{135}{12}$

Answer 2

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✯ 3x + 9x = 135

=> 12x = 135

=> x = $\dfrac{135}{12}$

=> x = $\dfrac{\cancel{135}}{\cancel{12}}$

=> x = $\dfrac{45}{4}$