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3x(5-8x)+4x(6x+9)=-51
We move all terms to the left:
3x(5-8x)+4x(6x+9)-(-51)=0
We add all the numbers together, and all the variables
3x(-8x+5)+4x(6x+9)-(-51)=0
We add all the numbers together, and all the variables
3x(-8x+5)+4x(6x+9)+51=0
We multiply parentheses
-24x^2+24x^2+15x+36x+51=0
We add all the numbers together, and all the variables
51x+51=0
We move all terms containing x to the left, all other terms to the right
51x=-51
x=-51/51
x=-1
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