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143=3+10x
We move all terms to the left:
143-(3+10x)=0
We add all the numbers together, and all the variables
-(10x+3)+143=0
We get rid of parentheses
-10x-3+143=0
We add all the numbers together, and all the variables
-10x+140=0
We move all terms containing x to the left, all other terms to the right
-10x=-140
x=-140/-10
x=+14
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