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129-15x=180
We simplify the equation to the form, which is simple to understand
129-15x=180
We move all terms containing x to the left and all other terms to the right.
-15x=+180-129
We simplify left and right side of the equation.
-15x=+51
We divide both sides of the equation by -15 to get x.
x=-3.4
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