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2x+7(-3x-9)-(7x+1)+5x-4=-(6x+2)-3(4x+5)+12
We simplify the equation to the form, which is simple to understand
2x+7(-3x-9)-(7x+1)+5x-4=-(6x+2)-3(4x+5)+12
Reorder the terms in parentheses
2x+(-21x-63)-(7x+1)+5x-4=-(6x+2)-3*(4x+5)+12
Remove unnecessary parentheses
+2x-21x-63-(+7x+1+)+5x-4=-(+6x+2+)-3+*(+4x+5+)+12
Remove unnecessary parentheses
2x-21x-63-7x-1+5x-4=-(6x+2)-3*(4x+5)+12
Remove unnecessary parentheses
2x-21x-63-7x-1+5x-4=-6x-2-3*(4x+5)+12
Reorder the terms in parentheses
2x-21x-63-7x-1+5x-4=-6x-2+(-12x-15)+12
Remove unnecessary parentheses
+2x-21x-63-7x-1+5x-4=-6x-2-12x-15+12
We move all terms containing x to the left and all other terms to the right.
+2x-21x-7x+5x+6x+12x=-2-15+12+63+1+4
We simplify left and right side of the equation.
-3x=+63
We divide both sides of the equation by -3 to get x.
x=-21
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