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3x+7+4x-16=90
We simplify the equation to the form, which is simple to understand
3x+7+4x-16=90
We move all terms containing x to the left and all other terms to the right.
+3x+4x=+90-7+16
We simplify left and right side of the equation.
+7x=+99
We divide both sides of the equation by 7 to get x.
x=14.142857142857
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