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7x-40+4x=180
We simplify the equation to the form, which is simple to understand
7x-40+4x=180
We move all terms containing x to the left and all other terms to the right.
+7x+4x=+180+40
We simplify left and right side of the equation.
+11x=+220
We divide both sides of the equation by 11 to get x.
x=20
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