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144=4x+21+3x
We simplify the equation to the form, which is simple to understand
144=4x+21+3x
We move all terms containing x to the left and all other terms to the right.
-4x-3x=+21-144
We simplify left and right side of the equation.
-7x=-123
We divide both sides of the equation by -7 to get x.
x=17.5714285714
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