Question

please tell me the answer step by step for class 7 th​

Answer 1

SUM = 3$x^{2}$ - 3$y^{2}$+7+$x^{2} -y^{2}$

        = $4x^{2} -4y^{2} +7$

Let x be subtracted.

According to the equation ⇒ ($4x^{2} -4y^{2} +7$) - x = 7

                                            ⇒ $4x^{2} -4y^{2} +7$ = 7+ x

                                            ⇒x= $4x^{2} -4y^{2} +7$ - 7

                                            ⇒ x = $4x^{2} - 4y^{2}$

PLEASE MARK THIS AS THE BRAINLIEST .