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139=7x+3(4x-17)
We move all terms to the left:
139-(7x+3(4x-17))=0
We calculate terms in parentheses: -(7x+3(4x-17)), so:We get rid of parentheses
7x+3(4x-17)
We multiply parentheses
7x+12x-51
We add all the numbers together, and all the variables
19x-51
Back to the equation:
-(19x-51)
-19x+51+139=0
We add all the numbers together, and all the variables
-19x+190=0
We move all terms containing x to the left, all other terms to the right
-19x=-190
x=-190/-19
x=+10
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