$7\left(X-Y\right)$

$-7\left(X+Y\right)$

$-7\left(-X-Y\right)$

$-7\left(-X+Y\right)$

$a\left(15-x\right)$

$a\left(15-ax\right)$

$15a\left(1-x\right)$

$5a\left(3-x\right)$

$y\left(25x+7+b\right)$

$y\left(25+7+b\right)$

$7y\left(3x+x+b\right)$

$y\left(25+7x+b\right)$

$2x^2\left(x+1\right)$

$2x\left(1+x\right)$

$2x\left(x-1\right)$

$x\left(2x+2x\right)$

$4a\left(b+4c-16a^2\right)$

$2a\left(b+2c-8a\right)$

$4a\left(b+2c-4a\right)$

$4a\left(b+2c-8\right)$

$x^2+8x+15$

$13x+15$

$x^2+3x$

$3x+15$

$x^2-x+6$

$x^2+x+6$

$x-6$

$x^2-x-6$

$-x^2-2x+35$

$x^2+2x+35$

$-x^2+12x+35$

$x^2-12x+35$

$12a^2+36a+15$

$48a+15$

$6a^2+6a+15$

$12a+15$

$2x^2+16x+34$

$2x^2+6x+16$

$6x+34$

$16x+16$

$2x^2+7x+38$

$-9x-10$

$2x^2-9x+38$

$9x+10$

$7.5$

$75$

$0.75$

$7$

$315$

$3.15$

$31.5$

$0.315$

$80$

$0.08$

$800$

$0.8$

$36$

$360$

$3.6$

$144$

$70$

$235$

$27$

$270$

1), 2)

1), 3)

2), 3)

2), 4)

1)

2)

3)

4)

א

ב

ג

ד