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9x+40=15-x
We simplify the equation to the form, which is simple to understand
9x+40=15-x
We move all terms containing x to the left and all other terms to the right.
+9x+1x=+15-40
We simplify left and right side of the equation.
+10x=-25
We divide both sides of the equation by 10 to get x.
x=-2.5
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