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123456789*87654321=4x
We move all terms to the left:
123456789*87654321-(4x)=0
We add all the numbers together, and all the variables
-4x+10821521012635269=0
We move all terms containing x to the left, all other terms to the right
-4x=-10821521012635269
x=-10821521012635269/-4
x=+2.70538025316E+15
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