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90+90+x+x+22+x+22+x=720
We simplify the equation to the form, which is simple to understand
90+90+x+x+22+x+22+x=720
We move all terms containing x to the left and all other terms to the right.
+1x+1x+1x+1x=+720-90-90-22-22
We simplify left and right side of the equation.
+4x=+496
We divide both sides of the equation by 4 to get x.
x=124
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