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4x+3+3x+3=90
We simplify the equation to the form, which is simple to understand
4x+3+3x+3=90
We move all terms containing x to the left and all other terms to the right.
+4x+3x=+90-3-3
We simplify left and right side of the equation.
+7x=+84
We divide both sides of the equation by 7 to get x.
x=12
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