x+(3x+10-4)+(3x+ 10)=72
Quit parenthesis:
x+3x+10-4+3x+10=72
Combine like terms:
x+3x+3x+10-4+10=72
7x +16 =72
Subtract 16 from both sides of the equation:
7x+16-16 = 72-16
7x= 56
Finally divide both sides by 7:
7x/7 =56/7
x= 8
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