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3x+7+7x+2+79=90
We simplify the equation to the form, which is simple to understand
3x+7+7x+2+79=90
We move all terms containing x to the left and all other terms to the right.
+3x+7x=+90-7-2-79
We simplify left and right side of the equation.
+10x=+2
We divide both sides of the equation by 10 to get x.
x=0.2
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