hello!

can you please solve only #5 and #7

thank you!

Prove that the following arguments are invalid. (1) 1. (x)(AxBx) 2. (x)(BxCx) I (x)(AxCx) (2) 1. (x)(AxBx) 2. (x)Ax/(x)Bx (3) 1. (x)(AxBx) 2. (x)(AxCx) 3. (x)(BxDx) 1(x)[Ax(BxDx)] (4) 1. (x)(FxGx) 2. (x)(FXEx) 1(x)(GxEx) (5) 1. (x)(PxQx) 2. (x)(RxPx) I(x)(RxQx) (6) 1. (x)[(PxQx)Rx] 2. (x)(QxRx) 1(x)(PXQX) (7) 1. (x)(PxQx) 2. (x)(QxRx) 1(x)(PxRx) (8) 1. (x)[Mx(NxPx)] 2. (x)(QxPx) 1(x)[Qx(MxNx)] (9) 1. (x)(AxBx) 2. (x)(BxCx) 1(x)(AxCx) (10) 1. (x)(AxBx) 2. (x)[(AxBx)Cx] 1(x)Cx