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-21+(-20x)+4+34x=0
We simplify the equation to the form, which is simple to understand
-21+(-20x)+4+34x=0
Remove unnecessary parentheses
-21-20x+4+34x=0
We move all terms containing x to the left and all other terms to the right.
-20x+34x=0+21-4
We simplify left and right side of the equation.
+14x=+17
We divide both sides of the equation by 14 to get x.
x=1.21428571429
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