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(2x-1)+(8x-9)=90
We simplify the equation to the form, which is simple to understand
(2x-1)+(8x-9)=90
Remove unnecessary parentheses
2x-1+(8x-9)=90
Remove unnecessary parentheses
+2x-1+8x-9=+90
We move all terms containing x to the left and all other terms to the right.
+2x+8x=+90+1+9
We simplify left and right side of the equation.
+10x=+100
We divide both sides of the equation by 10 to get x.
x=10
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