Explicación paso a paso:
Problema1
2x+7 = 33
2x =33-7
2x =26
x =26/2
x =13
Problema2
x-1.75 =10.25
x =10.25+1.75
x =12
Problema3
x+230 =750
x =750 - 230
x =520
Problema4
5x+62.5 =100
5x = 100-62.5
5x = 37.5
x = 37.5 /5
x= 7.5
Problema5
5x+3 =33
5x =33-3
5x =30
x =30 /5
x=6