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2x-7-1+2x-7-1+x-4+x-4=66
We simplify the equation to the form, which is simple to understand
2x-7-1+2x-7-1+x-4+x-4=66
We move all terms containing x to the left and all other terms to the right.
+2x+2x+1x+1x=+66+7+1+7+1+4+4
We simplify left and right side of the equation.
+6x=+90
We divide both sides of the equation by 6 to get x.
x=15
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