Question

7*(6x+1)+4*(2-3x)-9*(9x+4)=30

Answer 1

7*(6x+1)+4*(2-3x)-9*(9x+4)=30
42x+7+8-12x-81x-36=30
-51x-21=30
-51x=30+21
-51x=51
x=51:(-51)
x=-1

Answer 2

42x+7+8-12x-81x-36=30
42x-12x-81x=30-7-8+36
-51x=51x
x=-1