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(5x-26)+(8x+21)+(6x+29)=299
We move all terms to the left:
(5x-26)+(8x+21)+(6x+29)-(299)=0
We get rid of parentheses
5x+8x+6x-26+21+29-299=0
We add all the numbers together, and all the variables
19x-275=0
We move all terms containing x to the left, all other terms to the right
19x=275
x=275/19
x=14+9/19
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