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2x+5-6x+21=2(3x-5)-4
We simplify the equation to the form, which is simple to understand
2x+5-6x+21=2(3x-5)-4
Reorder the terms in parentheses
2x+5-6x+21=+(+6x-10)-4
Remove unnecessary parentheses
+2x+5-6x+21=+6x-10-4
We move all terms containing x to the left and all other terms to the right.
+2x-6x-6x=-10-4-5-21
We simplify left and right side of the equation.
-10x=-40
We divide both sides of the equation by -10 to get x.
x=4
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