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step by step:
15-g=23-2g transpose -2g to other side
15-g+2g=23-2g+2g cancel 2g on the right side, and do operation on the left side
15+g=23 transpose 15 to other side to obtain variable=constant
15-15+g=23-15 cancel 15 on the left side, and do operation on the right side
g=8 you already have the value of g
Normal way:
15-g=23-2g
2g-g=23-15
g=8
I hope this could help you...
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