tolong bantu no 6,7,8 dengan cara

6. 3x√8-√2+3√2
=3x√4.2-√2+3√2
=3x2√2-√2+3√2
=6√2-√2+3√2
=8√2 (a)

7. 7(3y+2x)-2(5x+y)
=21y+14y-10x-2y
=11x+12y (d)

8. 6x+5=4x-9
6x-4x=-9-5
2x=-14
x=-7
x+2=-7+2
x+2=-5